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Stockholders' Equity - Restricted Stock Unit Activity (Details) - Restricted Stock Units (RSUs)
shares in Thousands
12 Months Ended
Dec. 31, 2017
$ / shares
shares
Restricted Stock Units  
Nonvested balance at beginning of period (in shares) | shares 2,246
Grants (in shares) | shares 1,180
Vested (in shares) | shares (841)
Forfeitures (in shares) | shares (20)
Vested but not released (in shares) | shares (307)
Nonvested balance at end of period (in shares) | shares 2,258
Weighted-Average Grant Date Fair Value  
Nonvested balance at beginning of period, Weighted-Average Grant Date Fair Value (in dollars per share) | $ / shares $ 6.81
Grants, Weighted-Average Grant Date Fair Value (in dollars per share) | $ / shares 7.45
Vested, Weighted-Average Grant Date Fair Value (in dollars per share) | $ / shares 7.48
Forfeitures, Weighted-Average Grant Date Fair Value (in dollars per share) | $ / shares 7.28
Vested but not released, Weighted-Average Grant Date Fair Value (in dollars per share) | $ / shares 7.24
Nonvested balance at end of period, Weighted-Average Grant Date Fair Value (in dollars per share) | $ / shares $ 6.83