Share-Based Employee Compensation - Additional Information (Details)
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3 Months Ended |
9 Months Ended |
|
|
Sep. 30, 2016
USD ($)
$ / shares
shares
|
Sep. 30, 2015
USD ($)
$ / shares
shares
|
Sep. 30, 2016
USD ($)
plan
$ / shares
shares
|
Sep. 30, 2015
USD ($)
$ / shares
shares
|
Dec. 31, 2015
USD ($)
|
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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|
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| Number of shareholder approved stock plans | plan |
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|
2
|
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| Cost (reversal) of employee share-based compensation included in income, before income tax |
$ 2,265,000
|
$ 1,470,000
|
$ 6,800,000
|
$ 8,137,000
|
|
| Stock Options |
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|
|
|
|
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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|
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| Number of stock options granted | shares |
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|
0
|
0
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| Compensation expense related to stock options |
8,000
|
$ 320,000
|
$ 137,000
|
$ 1,064,000
|
|
| Total unrecognized compensation expense related to non-vested shares granted |
56,000
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|
$ 56,000
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|
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| Number of years compensation expense to be recognized over |
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|
1 year 8 months 1 day
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| Restricted Stock Units (RSUs) |
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|
|
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
|
|
|
|
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| Total unrecognized compensation expense related to non-vested shares granted |
$ 7,466,000
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|
$ 7,466,000
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|
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| Number of years compensation expense to be recognized over |
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|
2 years 1 month 9 days
|
|
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| Number of stock units granted | shares |
126,000
|
8,000
|
665,000
|
556,000
|
|
| Stock units, weighted average grant-date fair value (usd per share) | $ / shares |
$ 11.49
|
$ 9.10
|
$ 9.20
|
$ 8.30
|
|
| Compensation expense related to restricted stocks |
$ 1,055,000
|
$ 865,000
|
$ 3,157,000
|
$ 2,626,000
|
|
| Restricted Stock Units (RSUs) | Minimum |
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|
|
|
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
|
|
|
|
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| Vesting period |
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|
1 year
|
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| Restricted Stock Units (RSUs) | Maximum |
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|
|
|
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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|
|
|
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| Vesting period |
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|
3 years
|
|
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| Performance Shares |
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|
|
|
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
|
|
|
|
|
| Total unrecognized compensation expense related to non-vested shares granted |
$ 5,938,000
|
|
$ 5,938,000
|
|
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| Number of years compensation expense to be recognized over |
|
|
1 year 4 months 13 days
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|
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| Vesting period |
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3 years
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|
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| Number of stock units granted | shares |
0
|
0
|
420,000
|
509,000
|
|
| Stock units, weighted average grant-date fair value (usd per share) | $ / shares |
|
|
$ 8.61
|
$ 7.96
|
|
| Cost (reversal) of employee share-based compensation included in income, before income tax |
$ 1,073,000
|
$ 790,000
|
$ 3,170,000
|
$ 1,846,000
|
|
| Performance Shares | Minimum |
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|
|
|
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
|
|
|
|
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| Award requisite service period |
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1 year
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|
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| Shares awarded as a percentage of granted |
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|
0.00%
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| Performance Shares | Maximum |
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|
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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|
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| Award requisite service period |
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3 years
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|
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| Shares awarded as a percentage of granted |
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|
200.00%
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| Phantom Stock Units |
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|
|
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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|
|
|
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| Number of stock units granted | shares |
0
|
0
|
|
0
|
|
| Cost (reversal) of employee share-based compensation included in income, before income tax |
$ 0
|
$ 0
|
$ 0
|
$ 390,000
|
|
| Stock Appreciation Rights (SARs) |
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|
|
|
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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|
|
|
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| Vesting period |
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|
3 years
|
|
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| Number of stock units granted | shares |
|
|
0
|
0
|
|
| Cost (reversal) of employee share-based compensation included in income, before income tax |
129,000
|
$ (505,000)
|
$ 336,000
|
$ 2,211,000
|
|
| Accrued compensation expense |
$ 427,000
|
|
$ 427,000
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|
$ 1,460,000
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