Dividends (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended			6 Months Ended
	Jun. 30, 2015	Mar. 31, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Dividends Payable [Line Items]
Dividends, Date Declared	May 05, 2015	Feb. 03, 2015
Dividends declared per common share	$ 0.30	$ 0.30	$ 0	$ 0.60	$ 0
Dividends, Date of Record	Jun. 09, 2015	Mar. 03, 2015
Dividends, Date Paid	Jun. 23, 2015	Mar. 18, 2015
Dividends paid	$ 5,417	$ 5,602	$ 0	$ 11,019	$ 0
Paid to recipients of unvested restricted stock awards
Dividends Payable [Line Items]
Dividends paid	$ 100	$ 200