Net Income per Share (Details) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Net income	$ 10,219	[1]	$ 22,423	[1]
Less: earnings allocated to RSUs	(375)
Net income (loss) available to common shareholders	$ 9,844
Weighted average number of common shares outstanding	28,776,000		28,595,000
Potential dilutive shares	0
Weighted average number of diluted shares outstanding	28,776,000		28,906,000
Basic	$ 0.34		$ 0.78
Diluted	$ 0.34		$ 0.78
Restricted Stock Units (RSUs) [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potential dilutive shares	1,042,000

[1] There is no material difference between net income and comprehensive income.