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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, 2019
$ / shares
shares
Shares  
Non-vested awards at the beginning of the period (in shares) | shares 1,728
Granted (in shares) | shares 1,383
Vested (in shares) | shares (402)
Canceled (in shares) | shares (153)
Non-vested awards at the end of the period (in shares) | shares 2,556
Weighted Average Grant Date Fair Value Per Share  
Non-vested awards at the beginning of the period (in dollars per share) | $ / shares $ 9.68
Granted (in dollars per share) | $ / shares 10.01
Vested (in dollars per share) | $ / shares 6.33
Canceled (in dollars per share) | $ / shares 10.33
Non-vested awards at the end of the period (in dollars per share) | $ / shares $ 10.35