Stockholders' Equity: (Tables)

12 Months Ended

Dec. 31, 2013

Stockholders' equity:

Summary of the Company's quarterly dividends since the initial dividend payment

A summary of the Company's quarterly dividends paid since its initial dividend payment is as follows (in thousands, except per share amounts):

Dividend Period	Amount per Common Share		Record Date	Payment Date	Dividends Paid
Q3 2012	$	0.10	August 22, 2012	September 12, 2012	$	4,537
Q4 2012	$	0.11	November 21, 2012	December 12, 2102	$	5,012
Q1 2013	$	0.12	March 4, 2013	March 15, 2013	$	5,489
Q2 2013	$	0.13	May 31, 2013	June 18, 2013	$	6,145
Q3 2013	$	0.14	September 5, 2013	September 25, 2013	$	6,512
Q4 2013	$	0.37	November 27, 2013	December 20, 2013	$	17,206