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Stock-Based Compensation (Narratives) (Details) (USD $)
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12 Months Ended |
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Dec. 31, 2013
|
Dec. 31, 2012
|
Dec. 31, 2011
|
| Stock-based Compensation Arrangements [Line Items] |
|
|
|
| Equity Compensation Plan, Aggregate Number of Shares Authorized |
4,150,000 |
|
|
| Equity Compensation Plan, Number of Shares Available for Grant |
917,341 |
|
|
| Number of Shares, Stock Options Granted |
0 |
0 |
0 |
| Stock-based Compensation Expense |
$ 2,600,000 |
$ 2,600,000 |
$ 2,300,000 |
| Stock Options Exercised, Number of Shares |
127,957 |
89,900 |
169,611 |
| Stock Options Exercised, Total Intrinsic Value |
1,700,000 |
700,000 |
700,000 |
| Number of Shares, Stock Options Forfeited |
4,229 |
17,154 |
3,325 |
| Weighted Average Exercise Price Per Share, Option Forfeitures |
$ 10.38 |
$ 10.33 |
$ 13.72 |
| Weighted Average Exercise Price Per Share, Options Granted |
$ 0 |
$ 0 |
$ 0 |
| Excess tax benefits from stock-based payment arrangements |
1,052,000 |
592,000 |
1,283,000 |
| Common Stock Closing Price Per Share |
$ 25.2 |
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Stock Options [Member]
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|
|
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| Stock-based Compensation Arrangements [Line Items] |
|
|
|
| Number of Shares, Stock Options Granted |
0 |
0 |
0 |
| Stock-based Compensation Expense |
200,000 |
100,000 |
100,000 |
| Total Compensation Cost Not yet Recognized on Nonvested Stock-based Awards |
100,000 |
|
|
| Compensation Cost Not yet Recognized on Nonvested Stock-based Awards, Period for Recognition in Years |
5 months |
|
|
| Stock-based Awards, Vesting Period in Years |
4 years |
|
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| Total Compensation Cost Not yet Recognized on Nonvested Stock-based Awards, Portion Subject to Pre-expiration Vesting |
500,000 |
|
|
| Total Compensation Cost Not yet Recognized on Nonvested Stock-based Awards, Portion Subject to Pre-expiration Vesting, Period for Recognition, in Years |
2 years 1 month |
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|
|
Stock Options [Member] | Director [Member]
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|
|
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| Stock-based Compensation Arrangements [Line Items] |
|
|
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| Stock-based Awards, Vesting Period in Years |
1 year |
|
|
|
Stock Options [Member] | Minimum [Member]
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|
|
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| Stock-based Compensation Arrangements [Line Items] |
|
|
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| Equity Compensation Plan, Grant Original Contractual Term in Years |
7 years |
|
|
|
Stock Options [Member] | Maximum [Member]
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|
|
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| Stock-based Compensation Arrangements [Line Items] |
|
|
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| Equity Compensation Plan, Grant Original Contractual Term in Years |
10 years |
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|
|
Restricted Stock [Member]
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|
|
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| Stock-based Compensation Arrangements [Line Items] |
|
|
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| Equity Compensation Plan, Aggregate Number of Shares Authorized |
2,500,000 |
|
|
| Equity Compensation Plan, Number of Shares Available for Grant |
738,569 |
|
|
| Stock-based Compensation Expense |
2,400,000 |
2,500,000 |
2,200,000 |
| Total Compensation Cost Not yet Recognized on Nonvested Stock-based Awards |
3,800,000 |
|
|
| Compensation Cost Not yet Recognized on Nonvested Stock-based Awards, Period for Recognition in Years |
4 years 1 month |
|
|
| Total Compensation Cost Not yet Recognized on Nonvested Stock-based Awards, Period for Recognition of Incremental Cost at Maximum Performance in Years |
1 year |
|
|
| Stock-based Awards Other Than Options, Subject to Performance Acceleration, Grants in Period |
89,952 |
|
|
| Stock-based Awards Other Than Options, Contingent on Performance, Grants in Period |
0 |
|
|
| Stock-based Awards, Grants in Period, Aggregate Grant Date Fair Value |
3,300,000 |
1,400,000 |
3,300,000 |
| Stock-based Compensation Expense Due to Performance Acceleration |
400,000 |
1,000,000 |
|
| Total Compensation Cost Not yet Recognized on Nonvested Stock-based Awards, Portion Subject to Acceleration |
1,600,000 |
|
|
| Stock-based Awards Other Than Options, Additional Grants Contingently Issuable |
58,757 |
|
|
| Stock-based Awards Other Than Options, Additional Grants Contingently Issuable Achievement Threshold |
100.00% |
|
|
| Stock-based Awards Other than Options, Vested in Period, Total Fair Value |
3,500,000 |
4,700,000 |
5,100,000 |
|
Restricted Stock [Member] | Minimum [Member]
|
|
|
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| Stock-based Compensation Arrangements [Line Items] |
|
|
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| Stock-based Awards, Vesting Period in Years |
3 years |
|
|
|
Restricted Stock [Member] | Minimum [Member] | Director [Member]
|
|
|
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| Stock-based Compensation Arrangements [Line Items] |
|
|
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| Stock-based Awards, Vesting Period in Years |
6 months |
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|
|
Restricted Stock [Member] | Maximum [Member]
|
|
|
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| Stock-based Compensation Arrangements [Line Items] |
|
|
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| Stock-based Awards, Vesting Period in Years |
10 years |
|
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|
Restricted Stock [Member] | Maximum [Member] | Director [Member]
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|
|
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| Stock-based Compensation Arrangements [Line Items] |
|
|
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| Stock-based Awards, Vesting Period in Years |
7 years |
|
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Employee Stock Purchase Plan 2003 [Member]
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|
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| Stock-based Compensation Arrangements [Line Items] |
|
|
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| Equity Compensation Plan, Aggregate Number of Shares Authorized |
200,000 |
|
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| Employee Stock Purchase Plan, Maximum Employee Compensation Contribution Percentage |
10.00% |
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| Employee Stock Purchase Plan, Purchase Price Per Share as Percent of Fair Market Value |
95.00% |
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| Employee Stock Purchase Plan, Number Of Shares Available For Issuance |
0 |
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Employee Stock Purchase Plan 2012 [Member]
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|
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| Stock-based Compensation Arrangements [Line Items] |
|
|
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| Equity Compensation Plan, Aggregate Number of Shares Authorized |
140,000 |
|
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| Employee Stock Purchase Plan, Maximum Employee Compensation Contribution Percentage |
10.00% |
|
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| Employee Stock Purchase Plan, Purchase Price Per Share as Percent of Fair Market Value |
95.00% |
|
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| Employee Stock Purchase Plan, Issuance of Common Stock, Shares |
14,727 |
8,788 |
14,597 |
| Employee Stock Purchase Plan, Issuance of Common Stock, Value |
$ 300,000 |
$ 100,000 |
$ 200,000 |
| Employee Stock Purchase Plan, Number Of Shares Available For Issuance |
116,485 |
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