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Equity - Stock Based Compensation (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Restricted Stock      
Shares:      
Beginning balance (in shares) 543,707 541,180  
Granted (in shares) 629,504 281,491 263,039
Vested (in shares) (335,544) (275,051) (350,788)
Canceled (in shares) (9,717) (3,913)  
Ending balance (in shares) 827,950 543,707 541,180
Weighted-Average Grant-Date Fair Value:      
Beginning balance (in dollars per share) $ 26.43 $ 19.98  
Granted (in dollars per share) 29.01 29.38 $ 22.16
Vested (in dollars per share) 24.80 16.83  
Canceled (in dollars per share) 38.17 20.44  
Ending balance (in dollars per share) $ 28.92 $ 26.43 $ 19.98
Total Vest-Date Fair Value (in thousands) $ 9,606 $ 9,794 $ 7,664
Stock-based Compensation, Existing and Newly Elected Board Member      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting period 3 years    
Stock-based Compensation, Employees      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting period 3 years    
Award hold post-vesting period 2 years