Dividends (Tables)

12 Months Ended

Dec. 31, 2013

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, 2013: 

Declaration Date	Dividend per Common  Share		Aggregate Dividend Amount		Record Date	Payment Date
December 6, 2010	$	0.100	$	7,964	December 31, 2010	January 14, 2011
March 8, 2011	$	0.100	$	7,857	March 31, 2011	April 15, 2011
June 27, 2011	$	0.125	$	9,364	July 7, 2011	July 15, 2011
September 14, 2011	$	0.125	$	9,035	September 30, 2011	October 14, 2011
November 7, 2011	$	0.150	$	10,839	November 30, 2011	December 15, 2011
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