Capital Stock - Dividends (Details) (USD $)	1 Months Ended																									3 Months Ended								12 Months Ended
	Feb. 28, 2015	Jan. 31, 2015	Dec. 31, 2014	Nov. 30, 2014	Oct. 31, 2014	Sep. 30, 2014	Aug. 31, 2014	Jul. 31, 2014	Jun. 30, 2014	May 31, 2014	Apr. 30, 2014	Mar. 31, 2014	Feb. 28, 2014	Jan. 31, 2014	Dec. 31, 2013	Nov. 30, 2013	Oct. 31, 2013	Sep. 30, 2013	Aug. 31, 2013	Jul. 31, 2013	Jun. 30, 2013	May 31, 2013	Apr. 30, 2013	Mar. 31, 2013	Feb. 28, 2013	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Cash Dividends [Abstract]
Declaration Date	February 10, 2015	January 13, 2015	December 9, 2014	November 12, 2014	October 9, 2014	September 9, 2014	August 12, 2014	July 10, 2014	June 11, 2014	May 8, 2014	April 8, 2014	March 11, 2014	February 11, 2014	January 9, 2014	December 11, 2013	November 12, 2013	October 10, 2013	September 10, 2013	August 12, 2013	July 9, 2013	June 10, 2013	May 9, 2013	April 10, 2013	March 8, 2013
Record Date	February 25, 2015	January 26, 2015	December 26, 2014	November 25, 2014	October 28, 2014	September 25, 2014	August 26, 2014	July 28, 2014	June 25, 2014	May 27, 2014	April 25, 2014	March 26, 2014	February 25, 2014	January 27, 2014	December 26, 2013	November 25, 2013	October 25, 2013	September 25, 2013	August 26, 2013	July 25, 2013	June 25, 2013	May 28, 2013	April 25, 2013	March 25, 2013
Payment Date	February 27, 2015	January 30, 2015	December 30, 2014	November 28, 2014	October 31, 2014	September 30, 2014	August 29, 2014	July 31, 2014	June 30, 2014	May 30, 2014	April 30, 2014	March 31, 2014	February 28, 2014	January 31, 2014	December 30, 2013	November 27, 2013	October 31, 2013	September 30, 2013	August 30, 2013	July 31, 2013	June 28, 2013	May 31, 2013	April 30, 2013	March 27, 2013
Per Share Amount	$ 0.18	$ 0.18	$ 0.18	$ 0.18	$ 0.18	$ 0.18	$ 0.18	$ 0.18	$ 0.18	$ 0.18	$ 0.18	$ 0.18	$ 0.18	$ 0.18	$ 0.18	$ 0.135	$ 0.135	$ 0.135	$ 0.135	$ 0.135	$ 0.135	$ 0.135	$ 0.135	$ 0.135		$ 0.54	$ 0.54	$ 0.54	$ 0.54	$ 0.45	$ 0.405	$ 0.405	$ 0.135	$ 2.16	$ 1.395
Total	$ 3,017,000	$ 3,017,000	$ 3,004,000	$ 2,737,000	$ 2,358,000	$ 2,348,000	$ 1,999,000	$ 1,759,000	$ 1,712,000	$ 1,641,000	$ 1,636,000	$ 1,550,000	$ 974,000	$ 925,000	$ 603,000	$ 451,000	$ 451,000	$ 451,000	$ 451,000	$ 451,000	$ 451,000	$ 451,000	$ 451,000	$ 451,000
Stock Dividend [Abstract]
Stock Dividend Declaration Date																									2/14/2013
Shares Issued For Each Share Outstanding																									5.37
Total Shares Issued Pursuant To Stock Dividend																									827,555											828,000
Stock Dividend Issue Date																									Feb. 20, 2013