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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
9 Months Ended
Sep. 30, 2018
$ / shares
shares
Shares  
Non-vested awards at the beginning of the period (in shares) | shares 1,440
Granted (in shares) | shares 1,148
Converted (in shares) | shares 140
Vested (in shares) | shares (747)
Canceled (in shares) | shares (219)
Non-vested awards at the end of the period (in shares) | shares 1,762
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 9.66
Converted (in dollars per share) | $ / shares 7.03
Vested (in dollars per share) | $ / shares 10.46
Canceled (in dollars per share) | $ / shares 9.79
Non-vested awards at the end of the period (in dollars per share) | $ / shares $ 9.69