Dividends (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended				12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Dividends Payable [Line Items]
Dividends, date declared				Feb. 03, 2015
Dividends, date paid	Dec. 08, 2015	Sep. 15, 2015	Jun. 23, 2015	Mar. 18, 2015
Dividends paid					$ 21,347
Dividends, date of record				Mar. 03, 2015
Dividends declared per common share (in usd per share)	$ 0.30	$ 0.30	$ 0.30	$ 0.30	$ 1.20	$ 0	$ 0
Paid to recipients of unvested restricted stock awards
Dividends Payable [Line Items]
Dividends paid					$ 600