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Stockholders' Equity (Summary of Restricted Stock Unit Activity and Weighted Average Exercise Price) (Details) - Restricted Stock Units (RSUs) [Member]
$ / shares in Units, shares in Thousands, $ in Thousands
9 Months Ended
Sep. 30, 2017
USD ($)
$ / shares
shares
Number of Shares (in thousands)  
Beginning balance outstanding (in shares) | shares 1,188
Awarded (in shares) | shares 317
Released (in shares) | shares (312)
Forfeited (in shares) | shares (244)
Non-vested and outstanding at end of period (in shares) | shares 949
Expected to vest (in shares) | shares 719
Weighted Average Grant Date Fair Value (usd per share)  
Beginning balance outstanding (in dollars per share) | $ / shares $ 8.44
Awarded (in dollars per share) | $ / shares 7.87
Released (in dollars per share) | $ / shares 8.40
Forfeited (in dollars per share) | $ / shares 8.46
Non-vested and outstanding at end of period (in dollars per share) | $ / shares 8.24
Expected to vest (in dollars per share) | $ / shares $ 8.44
Aggregate Fair Value (in thousands)  
Non-vested and outstanding at September 30, 2017 | $ $ 12,865
Expected to vest | $ $ 9,744