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Employee Compensation Plans - Stock Appreciation Rights (Details) |  | 12 Months Ended
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Dec. 31, 2017 $ / shares shares | Dec. 31, 2017 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Share Based Compensation Arrangement By Cash Payment Award Stock Appreciation Rights Outstanding Number | shares | 2,008,950 | 2,008,950
Share Based Compensation Arrangement By Cash Payment Award Stock Appreciation Rights unvested amount | shares | 1,697,170 | 1,697,170
Total Number of OARs outstanding | shares | 311,780 | 311,780
Total weighted average strike price | $ 19.35 | $ 19.35
Total weighted average remaining contractual life |  | 2 years 2 months
Total weighted average fair value per share | $ 8.93 | $ 8.93
January 13, 2011 |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Share Based Compensation Arrangement By Cash Payment Award Stock Appreciation Rights Outstanding Number | shares | 391,730 | 391,730
Strike price | $ 23.48 | $ 23.48
Remaining contractual life | 1 year |
Fair value per share | $ 4.7546 | $ 4.7546
January Nine Two Thousand Fifteen [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Share Based Compensation Arrangement By Cash Payment Award Stock Appreciation Rights Outstanding Number | shares | 444,660 | 444,660
Strike price | $ 21.94 | $ 21.94
Remaining contractual life | 2 years |
Fair value per share | $ 7.0884 | $ 7.0884
January Six Two Thousand Seventeen [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Share Based Compensation Arrangement By Cash Payment Award Stock Appreciation Rights Outstanding Number | shares | 421,660 | 421,660
Strike price | $ 18.90 | $ 18.90
Remaining contractual life | 4 years |
Fair value per share | $ 10.3525 | $ 10.3525
January Fourteen Two Thousand Thirteen [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Share Based Compensation Arrangement By Cash Payment Award Stock Appreciation Rights Outstanding Number | shares | 311,780 | 311,780
Strike price | $ 15.94 | $ 15.94
Remaining contractual life | 13 days |
Fair value per share | $ 10.8627 | $ 10.8627
January Fourteen Two Thousand Thirteen |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Share Based Compensation Arrangement By Cash Payment Award Stock Appreciation Rights Outstanding Number | shares | 439,120 | 439,120
Strike price | $ 15.89 | $ 15.89
Remaining contractual life | 3 years |
Fair value per share | $ 11.7673 | $ 11.7673

X
- Definition The fair value per share of each stock appreciation rights award outstanding by grant date as of the balance sheet date. + References No definition available. + Details
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