Restricted Stock Units Issued and Outstanding (Details) (2010 Incentive Award Plan, Restricted Stock Units (RSUs), USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2014
2010 Incentive Award Plan | Restricted Stock Units (RSUs)
Restricted Stock Units
Unvested, Beginning Balance	809,000
Granted	338,000
Vested	(361,000)
Forfeited	(37,000)
Unvested, Ending Balance	749,000
Expected to vest at end of period	734,000
Weighted Average Grant Date Fair Value
Unvested, Beginning Balance	$ 10.20
Granted	$ 12.26
Vested	$ 10.79
Forfeited	$ 11.06
Unvested, Ending Balance	$ 10.80
Expected to vest at end of period	$ 10.80
Weighted Average Remaining Vesting Period (in years)
Unvested at end of period	1 year 9 months 26 days
Expected to vest at end of period	1 year 9 months 26 days
Aggregate Intrinsic Value
Unvested at end of period	$ 11,019	[1]
Expected to vest at end of period	$ 10,797	[1]

[1] The aggregate intrinsic value is calculated based on the fair value of $14.72 per share of the Company’s common stock on December 31, 2014 due to the fact that the restricted stock units carry a $0 purchase price.