Quarterly Financial Information (Unaudited) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended	12 Months Ended
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
Quarterly Financial Information
Revenues	$ 30,755us-gaap_Revenues	$ 29,541us-gaap_Revenues	$ 29,227us-gaap_Revenues	$ 29,438us-gaap_Revenues	$ 28,593us-gaap_Revenues	$ 25,825us-gaap_Revenues	$ 25,279us-gaap_Revenues	$ 25,277us-gaap_Revenues	$ 118,961us-gaap_Revenues	$ 104,974us-gaap_Revenues	$ 92,482us-gaap_Revenues
Net income (loss) from discontinued operations						2,857	(701)	254
Net income available to common stockholders	$ 20,043	$ 16,181	$ 17,338	$ 16,083	$ 13,732	$ 16,373	$ 11,994	$ 12,060	$ 69,645	$ 54,159	$ 47,640
Net income per common share from continuing operations available to common stockholders:
Continuing operations (in dollars per share)	$ 0.58	$ 0.47	$ 0.50	$ 0.47	$ 0.40	$ 0.39	$ 0.39	$ 0.39	$ 2.01	$ 1.56	$ 1.54
Diluted (in dollars per share)	$ 0.57	$ 0.46	$ 0.50	$ 0.46	$ 0.40	$ 0.39	$ 0.39	$ 0.39	$ 1.99	$ 1.56	$ 1.54
Net income (loss) per common share from discontinued operations:
Discontinued operations (in dollars per share)						$ 0.08	$ (0.02)	$ 0.01		$ 0.07	$ 0.03
Diluted (in dollars per share)						$ 0.08	$ (0.02)	$ 0.01		$ 0.07	$ 0.03
Net income per common share available to common stockholders:
Basic (in dollars per share)	$ 0.58us-gaap_EarningsPerShareBasic	$ 0.47us-gaap_EarningsPerShareBasic	$ 0.50us-gaap_EarningsPerShareBasic	$ 0.47us-gaap_EarningsPerShareBasic	$ 0.40us-gaap_EarningsPerShareBasic	$ 0.47us-gaap_EarningsPerShareBasic	$ 0.36us-gaap_EarningsPerShareBasic	$ 0.40us-gaap_EarningsPerShareBasic	$ 2.01us-gaap_EarningsPerShareBasic	$ 1.64us-gaap_EarningsPerShareBasic	$ 1.58us-gaap_EarningsPerShareBasic
Diluted (in dollars per share)	$ 0.57us-gaap_EarningsPerShareDiluted	$ 0.46us-gaap_EarningsPerShareDiluted	$ 0.50us-gaap_EarningsPerShareDiluted	$ 0.46us-gaap_EarningsPerShareDiluted	$ 0.40us-gaap_EarningsPerShareDiluted	$ 0.47us-gaap_EarningsPerShareDiluted	$ 0.36us-gaap_EarningsPerShareDiluted	$ 0.40us-gaap_EarningsPerShareDiluted	$ 1.99us-gaap_EarningsPerShareDiluted	$ 1.63us-gaap_EarningsPerShareDiluted	$ 1.57us-gaap_EarningsPerShareDiluted
Dividends per share declared (in dollars per share)	$ 0.510	$ 0.510	$ 0.510	$ 0.510	$ 0.510	$ 0.465	$ 0.465	$ 0.465
Dividend per share paid (in dollars per share)	$ 0.510	$ 0.510	$ 0.510	$ 0.510	$ 0.510	$ 0.465	$ 0.465	$ 0.465	$ 2.040	$ 1.905	$ 1.790

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