Equity - Schedule of Share Based Compensation Activity (Details) - shares
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12 Months Ended |
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Dec. 31, 2015 |
Dec. 31, 2014 |
Dec. 31, 2013 |
Dec. 31, 2012 |
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Number of Outstanding of Stock Options and SARs |
747,573
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718,143
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664,245
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788,748
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| Exercisable Number of Stock Options and SARs |
543,698
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548,180
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483,216
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| Vested or Expected to Vest Stock Options and SARs |
736,851
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| Weighted Average Remaining Contractual Life Stock Options and SARs Vested and Expected to Vest |
8 years 2 months 12 days
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| Outstanding Non-Vested Restricted Stock |
132,651
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103,772
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98,285
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91,311
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| $5.00 to $9.99 [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Number of Outstanding of Stock Options and SARs |
18,666
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| Weighted Average Remaining Contractual Life Stock Options and SARs |
3 years 3 months 24 days
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| Exercisable Number of Stock Options and SARs |
18,666
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| Weighted Average Remaining Contractual Life Stock Options and SARs - Exercisable |
3 years 3 months 24 days
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| Vested or Expected to Vest Stock Options and SARs |
18,666
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| Weighted Average Remaining Contractual Life Stock Options and SARs Vested and Expected to Vest |
3 years 3 months 24 days
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| $10.00 to $14.99 [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Number of Outstanding of Stock Options and SARs |
66,665
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| Weighted Average Remaining Contractual Life Stock Options and SARs |
4 years 4 months 24 days
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| Exercisable Number of Stock Options and SARs |
66,665
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| Weighted Average Remaining Contractual Life Stock Options and SARs - Exercisable |
4 years 4 months 24 days
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| Vested or Expected to Vest Stock Options and SARs |
66,665
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| Weighted Average Remaining Contractual Life Stock Options and SARs Vested and Expected to Vest |
4 years 4 months 24 days
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| $15.00 - $19.99 [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Number of Outstanding of Stock Options and SARs |
62,000
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| Weighted Average Remaining Contractual Life Stock Options and SARs |
5 years 4 months 24 days
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| Exercisable Number of Stock Options and SARs |
62,000
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| Weighted Average Remaining Contractual Life Stock Options and SARs - Exercisable |
5 years 4 months 24 days
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| Vested or Expected to Vest Stock Options and SARs |
62,000
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| Weighted Average Remaining Contractual Life Stock Options and SARs Vested and Expected to Vest |
5 years 4 months 24 days
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| $20.00 to $24.99 [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Number of Outstanding of Stock Options and SARs |
100,500
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| Weighted Average Remaining Contractual Life Stock Options and SARs |
5 years 1 month 24 days
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| Exercisable Number of Stock Options and SARs |
100,500
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| Weighted Average Remaining Contractual Life Stock Options and SARs - Exercisable |
5 years 1 month 24 days
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| Vested or Expected to Vest Stock Options and SARs |
100,500
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| Weighted Average Remaining Contractual Life Stock Options and SARs Vested and Expected to Vest |
5 years 1 month 24 days
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| $25.00 to $29.99 [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Number of Outstanding of Stock Options and SARs |
191,009
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| Weighted Average Remaining Contractual Life Stock Options and SARs |
1 year 11 months 6 days
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| Exercisable Number of Stock Options and SARs |
187,009
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| Weighted Average Remaining Contractual Life Stock Options and SARs - Exercisable |
1 year 8 months
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| Vested or Expected to Vest Stock Options and SARs |
190,809
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| Weighted Average Remaining Contractual Life Stock Options and SARs Vested and Expected to Vest |
1 year 11 months 6 days
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| Outstanding Non-Vested Restricted Stock |
6,778
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| Weighted Average Remaining Contractual Life Outstanding Non-Vested Restricted Stock |
2 years 1 month 12 days
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| Weighted Average Remaining Contractual LIfe Expected to Vest Restricted Stock |
2 years 1 month 12 days
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| $30.00 to $34.99 [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Number of Outstanding of Stock Options and SARs |
250,733
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| Weighted Average Remaining Contractual Life Stock Options and SARs |
7 years 9 months 6 days
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| Exercisable Number of Stock Options and SARs |
90,864
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| Weighted Average Remaining Contractual Life Stock Options and SARs - Exercisable |
6 years 1 month 12 days
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| Vested or Expected to Vest Stock Options and SARs |
241,931
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| Weighted Average Remaining Contractual Life Stock Options and SARs Vested and Expected to Vest |
7 years 9 months 6 days
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| Outstanding Non-Vested Restricted Stock |
124,324
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| Weighted Average Remaining Contractual Life Outstanding Non-Vested Restricted Stock |
1 year 2 months 12 days
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| Weighted Average Remaining Contractual LIfe Expected to Vest Restricted Stock |
1 year 2 months 12 days
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| $35.00 to $39.99 [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Number of Outstanding of Stock Options and SARs |
58,000
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| Weighted Average Remaining Contractual Life Stock Options and SARs |
8 years 2 months 12 days
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| Exercisable Number of Stock Options and SARs |
17,994
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| Weighted Average Remaining Contractual Life Stock Options and SARs - Exercisable |
8 years 3 months 12 days
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| Vested or Expected to Vest Stock Options and SARs |
56,280
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| Outstanding Non-Vested Restricted Stock |
1,549
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| Weighted Average Remaining Contractual Life Outstanding Non-Vested Restricted Stock |
1 year 2 months 18 days
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| Weighted Average Remaining Contractual LIfe Expected to Vest Restricted Stock |
1 year 2 months 18 days
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| Expected to Vest [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Outstanding Non-Vested Restricted Stock |
125,916
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| Expected to Vest [Member] | $25.00 to $29.99 [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Outstanding Non-Vested Restricted Stock |
6,439
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| Expected to Vest [Member] | $30.00 to $34.99 [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Outstanding Non-Vested Restricted Stock |
117,990
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| Expected to Vest [Member] | $35.00 to $39.99 [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Outstanding Non-Vested Restricted Stock |
1,487
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