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Stockholders' Equity - Reconciliation of Number of Shares of Common Stock (Details) - shares
5 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2018
Jun. 30, 2017
Stockholders Equity Note [Abstract]      
Common stock, beginning of period   44,251,000 45,721,000
Shares issued for stock options exercised     38,000
Shares of common stock issued upon lapse of restricted stock units ("RSUs")   329,000 341,000
Common stock retired (1,358,480) (1,412,000) (1,065,000)
Common stock, end of period 43,168,000 43,168,000 45,035,000