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Stockholders' Equity - Number and Cost of Common Stock Shares Repurchased (Details) - USD ($)
shares in Thousands, $ in Thousands
6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Equity [Abstract]    
Common stock repurchased (in shares) 2,137 1,694
Common stock repurchased $ 101,068 $ 66,536