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Share and Incentive Based Compensation - Awards Activity (Details) - $ / shares
shares in Thousands
1 Months Ended 3 Months Ended
Feb. 28, 2017
Mar. 31, 2018
Number of Units    
Unvested performance units outstanding at December 31, 2017   49
Granted   0
Vested   (10)
Forfeited / Canceled   (1)
Unvested performance units outstanding at March 31, 2018   38
Fair Value per Unit at March 31, 2018    
Employee Incentive Plan, Performance Units, Fair Value   $ 100.00
Restricted Stock    
Number of Shares    
Unvested shares outstanding at beginning of period   1,105
Granted (in shares)   3
Vested (in shares)   (228)
Forfeited / Canceled (in shares)   (17)
Unvested shares outstanding at end of period   863
Weighted- Average Grant Date Fair Value (usd per share)    
Unvested restricted shares outstanding at beginning of period (in usd per share)   $ 22.62
Granted (in usd per share)   15.45
Vested (in usd per share)   22.96
Forfeited / Canceled (in usd per share)   21.39
Unvested restricted shares outstanding at end of period (in usd per share)   $ 22.53
Performance Share Units    
Number of Shares    
Unvested shares outstanding at beginning of period   183
Granted (in shares)   0
Vested (in shares)   (36)
Forfeited / Canceled (in shares)   (3)
Unvested shares outstanding at end of period   144
Performance Share Units | Minimum    
Weighted- Average Grant Date Fair Value (usd per share)    
Unvested restricted shares outstanding at end of period (in usd per share)   $ 19.94
Performance Share Units | Maximum    
Number of Shares    
Granted (in shares) 400  
Weighted- Average Grant Date Fair Value (usd per share)    
Unvested restricted shares outstanding at end of period (in usd per share)   $ 20.00