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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, 2017
$ / shares
shares
Shares  
Non-vested awards at the beginning of the period (in shares) | shares 1,612
Granted (in shares) | shares 725
Vested (in shares) | shares (634)
Non-vested awards at the end of the period (in shares) | shares 1,703
Weighted Average Grant-Date Fair Value Per Share  
Non-vested awards at the beginning of the period (in dollars per share) | $ / shares $ 10.08
Granted (in dollars per share) | $ / shares 13.24
Vested (in dollars per share) | $ / shares 12.19
Non-vested awards at the end of the period (in dollars per share) | $ / shares $ 10.64