Restricted Stock Units Issued and Outstanding (Details) - 2010 Incentive Award Plan - Restricted Stock Units (RSUs) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2015 USD ($) $ / shares shares
Restricted Stock Units
Unvested, Beginning Balance | shares	749
Granted | shares	345
Vested | shares	(428)
Forfeited | shares	(47)
Unvested, Ending Balance | shares	619
Expected to vest at end of period | shares	605
Weighted Average Grant Date Fair Value
Unvested, Beginning Balance | $ / shares	$ 10.80
Granted | $ / shares	13.46
Vested | $ / shares	10.73
Forfeited | $ / shares	11.11
Unvested, Ending Balance | $ / shares	12.32
Expected to vest at end of period | $ / shares	$ 12.31
Weighted Average Remaining Vesting Period (in years)
Unvested at end of period	10 months 17 days
Expected to vest at end of period	10 months 17 days
Aggregate Intrinsic Value
Unvested at end of period | $	$ 8,429	[1]
Expected to vest at end of period | $	$ 8,243	[1]

[1] The aggregate intrinsic value is calculated based on the fair value of $13.62 per share of the Company’s common stock on December 31, 2015 due to the fact that the restricted stock units carry a $0 purchase price.