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Consolidated Statements of Stockholders' Equity (Deficit) (Parenthetical) - shares
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Statement of Stockholders' Equity [Abstract]    
Issuance of shares of common stock under long-term incentive plan (in shares)   17,233
Purchase of shares of common stock under share repurchase program (in shares) 3,238,615 3,977,215
Retirement of shares for payment of employee taxes upon vesting (in shares) 1,968