Dividends (Tables)

12 Months Ended

Dec. 31, 2014

Dividends [Abstract]

Quarterly dividends declared by board of directors

The following table sets forth the quarterly dividends declared by our Board of Directors for the three years ended December 31, 2014: 

Declaration Date	Dividend per Common  Share		Aggregate Dividend Amount		Record Date	Payment Date
February 17, 2012	$	0.150	$	10,865	February 29, 2012	March 15, 2012
May 2, 2012	$	0.150	$	10,847	May 31, 2012	June 15, 2012
August 1, 2012	$	0.150	$	10,464	August 31, 2012	September 14, 2012
November 5, 2012	$	0.165	$	11,493	November 30, 2012	December 14, 2012
February 18, 2013	$	0.165	$	11,268	March 4, 2013	March 15, 2013
May 1, 2013	$	0.165	$	11,297	May 31, 2013	June 14, 2013
August 2, 2013	$	0.165	$	13,330	August 30, 2013	September 13, 2013
October 29, 2013	$	0.200	$	16,163	November 29, 2013	December 13, 2013
February 21, 2014	$	0.200	$	16,201	March 7, 2014	March 14, 2014
May 5, 2014	$	0.200	$	16,202	May 30, 2014	June 13, 2014
July 28, 2014	$	0.200	$	16,201	August 29, 2014	September 12, 2014
October 31, 2014	$	0.220	$	17,817	November 28, 2014	December 15, 2014