SUMMARY OF QUARTERLY FINANCIAL INFORMATION Quarterly Financial Information Disclosure (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Quarterly Financial Information Disclosure [Abstract]
Revenue	$ 44,102	$ 41,085	$ 40,808	$ 42,291	$ 31,817	$ 29,580	$ 28,257	$ 25,333	$ 168,286	$ 114,987	$ 97,857
Income from continuing operations	7,576	8,893	7,967	9,590	8,440	6,242	5,612	3,325	34,026	23,619	18,611
Income from discontinued operations attributable to Common Shareholders	4,675	591	790	33	12,836	1,339	1,227	685	6,089	16,087	32,944
Net income attributable to Common Shareholders	$ 12,251	$ 9,484	$ 8,757	$ 9,623	$ 21,276	$ 7,581	$ 6,839	$ 4,010	$ 40,115	$ 39,706	$ 51,555
Net income attributable to Common Shareholders per Common Share - basic:
Income from continuing operations (in dollars per share)	$ 0.14	$ 0.16	$ 0.14	$ 0.18	$ 0.17	$ 0.13	$ 0.12	$ 0.08	$ 0.61	$ 0.51	$ 0.45
Income from discontinued operations (in dollars per share)	$ 0.08	$ 0.01	$ 0.02	$ 0.00	$ 0.25	$ 0.03	$ 0.03	$ 0.01	$ 0.11	$ 0.34	$ 0.80
Net income per share (in dollars per share)	$ 0.22	$ 0.17	$ 0.16	$ 0.18	$ 0.42	$ 0.16	$ 0.15	$ 0.09	$ 0.72	$ 0.85	$ 1.25
Net income attributable to Common Shareholders per Common Share - diluted:
Income from continuing operations (in dollars per share)	$ 0.14	$ 0.16	$ 0.14	$ 0.18	$ 0.17	$ 0.13	$ 0.12	$ 0.08	$ 0.61	$ 0.51	$ 0.45
Income from discontinued operations (in dollars per share)	$ 0.08	$ 0.01	$ 0.02	$ 0.00	$ 0.25	$ 0.03	$ 0.03	$ 0.01	$ 0.11	$ 0.34	$ 0.80
Net income per share (in dollars per share)	$ 0.22	$ 0.17	$ 0.16	$ 0.18	$ 0.42	$ 0.16	$ 0.15	$ 0.09	$ 0.72	$ 0.85	$ 1.25
Cash dividends declared per Common Share	$ 0.23	$ 0.21	$ 0.21	$ 0.21	$ 0.18	$ 0.18	$ 0.18	$ 0.18	$ 0.86	$ 0.72	$ 0.72