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Equity - Schedule of Nonvested Restricted Stock Units Activity (Details) - Restricted Stock - USD ($)
$ / shares in Units, $ in Thousands
6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Shares    
Beginning balance, Shares 543,707  
Granted 145,880 281,491
Vested (51,933) (275,051)
Canceled (6,346)  
Ending balance, Shares 631,308  
Weighted-Average Grant-Date Fair Value    
Beginning balance, Weighted-Average Grant-Date Fair Value $ 26.43  
Granted 31.17 $ 29.38
Vested 21.31  
Canceled 22.33  
Ending balance, Weighted-Average Grant-Date Fair Value $ 27.99  
Total Vest-Date Fair Value $ 1,576 $ 9,794