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Stockholders' Equity - Share Activity (Details)
3 Months Ended
Mar. 31, 2017
$ / shares
shares
Restricted Shares  
Number of Shares  
Beginning Balance, Shares 577,244
Granted, Shares 351,214
Vested, Shares (208,425)
Forfeited, Shares (5,061)
Ending Balance, Shares 714,972
Performance Shares  
Number of Shares  
Beginning Balance, Shares 345,656
Granted, Shares 0
Vested, Shares (107,320)
Forfeited, Shares 0
Ending Balance, Shares 238,336
Total  
Number of Shares  
Beginning Balance, Shares 922,900
Granted, Shares 351,214
Vested, Shares (315,745)
Forfeited, Shares (5,061)
Ending Balance, Shares 953,308
Weighted Average Grant Date Fair Value  
Begining Balance (usd per share) | $ / shares $ 58.15
Granted (usd per share) | $ / shares 49.51
Vested (usd per share) | $ / shares 51.88
Forfeited (usd per share) | $ / shares 63.71
Ending Balance (usd per share) | $ / shares $ 57.02