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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
3 Months Ended
Mar. 31, 2018
$ / shares
shares
Shares  
Non-vested awards at the beginning of the period (in shares) | shares 1,440
Granted (in shares) | shares 1,089
Vested (in shares) | shares (480)
Canceled (in shares) | shares (47)
Non-vested awards at the end of the period (in shares) | shares 2,002
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 9.50
Vested (in dollars per share) | $ / shares 9.57
Canceled (in dollars per share) | $ / shares 11.33
Non-vested awards at the end of the period (in dollars per share) | $ / shares $ 10.08