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Employee Compensation Plans - Stock Appreciation Rights (Details) | 12 Months Ended
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Dec. 31, 2015 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of OARs Outstanding | shares | 1,907,030
Total weighted average strike price (in dollars per share) | $ 21.36
Total weighted average remaining contractual life (in years) | 2 years 3 months 24 days
Total weighted average fair value per share (in dollars per share) | $ 2.02
January 13, 2011 |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of OARs Outstanding | shares | 289,320
Strike price (in dollars per share) | $ 26.35
Remaining contractual life (in years) | 12 days
Fair value per share (in dollars per share) | $ 0
January 19, 2012 |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of OARs Outstanding | shares | 324,710
Strike price (in dollars per share) | $ 18.94
Remaining contractual life (in years) | 1 year
Fair value per share (in dollars per share) | $ 1.52
January 14, 2013 |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of OARs Outstanding | shares | 347,130
Strike price (in dollars per share) | $ 15.94
Remaining contractual life (in years) | 2 years
Fair value per share (in dollars per share) | $ 3.45
January 14, 2014 |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of OARs Outstanding | shares | 442,790
Strike price (in dollars per share) | $ 23.48
Remaining contractual life (in years) | 3 years
Fair value per share (in dollars per share) | $ 1.78
January 9, 2015 |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of OARs Outstanding | shares | 503,080
Strike price (in dollars per share) | $ 21.94
Remaining contractual life (in years) | 4 years
Fair value per share (in dollars per share) | $ 2.74

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