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Stock-Based Compensation - Restricted Stock, Restricted Stock Units, and Performance Units Activity (Details) - Restricted stock, restricted stock units, performance units, cash settled restricted stock units and cash settled performance units
shares in Thousands
6 Months Ended
Jun. 30, 2018
$ / shares
shares
Shares  
Non-vested awards at the beginning of the period (in shares) | shares 1,440
Granted (in shares) | shares 1,098
Converted (in shares) | shares 140
Vested (in shares) | shares (503)
Canceled (in shares) | shares (47)
Non-vested awards at the end of the period (in shares) | shares 2,128
Weighted Average Grant Date Fair Value Per Share  
Non-vested awards at the beginning of the period (in dollars per share) | $ / shares $ 10.39
Granted (in dollars per share) | $ / shares 9.52
Converted (in dollars per share) | $ / shares 7.03
Vested (in dollars per share) | $ / shares 9.56
Canceled (in dollars per share) | $ / shares 11.33
Non-vested awards at the end of the period (in dollars per share) | $ / shares $ 9.89