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Summary of Significant Accounting Policies - Earnings Per Share (Details) - USD ($)
shares in Thousands, $ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Numerator (for basic and diluted earnings per share)    
Net (loss) income $ (1,939) $ 4,888
Less income allocated to RSUs 0 53
Numerator for basic and diluted earnings per share $ (1,939) $ 4,835
Denominator    
Basic weighted-average shares outstanding 82,079 83,965
Effect of dilutive securities:    
Stock options held by employees and directors 0 260
Diluted weighted-average shares outstanding 82,079 84,225
Anti-dilutive securities [1] 1,397 0
[1] (1) Amount outstanding at balance sheet date, before application of the treasury stock method and not weighted for period outstanding