SUMMARIZED CONDENSED CONSOLIDATING INFORMATION Condensed Consolidating Statement of Income (Details) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Revenues:
Rental income	$ 128,988	$ 101,742	$ 80,678
Interest income	5,792	1,428	3,547
Total revenues	134,780	103,170	84,225
Expenses:
Depreciation and amortization	33,281	30,263	26,591
Interest	40,460	34,335	30,319
General and administrative	16,423	16,104	14,473
Impairment	0	2,481	0
Total expenses	90,164	83,183	71,383
Other Nonoperating Income (Expense) [Abstract]
Loss on extinguishment of debt	(10,101)	(2,670)	0
Other expense	(800)	2,196	0
Total other income (expense)	(10,901)	(474)	0
(Income) loss in subsidiary	0	0	0
Net income	33,715	19,513	12,842
Preferred Stock Dividends, Income Statement Impact	(7,966)	0	0
Net Income (Loss) Available to Common Stockholders, Basic	25,749	19,513	12,842
Net income per common share, diluted	$ 0.68	$ 0.52	$ 0.43
Net income per common share, basic	$ 0.69	$ 0.53	$ 0.43
Weighted-average number of common shares outstanding, basic	37,514,637	37,061,111	30,109,417
Weighted-average number of common shares outstanding, diluted	38,071,926	37,321,517	30,171,225
Parent Company
Revenues:
Rental income	0	0	0
Interest income	86	18	64
Total revenues	86	18	64
Expenses:
Depreciation and amortization	51	49	53
Interest	0	0	0
General and administrative	15,040	14,631	9,905
Impairment		0
Total expenses	15,091	14,680	9,958
Other Nonoperating Income (Expense) [Abstract]
Loss on extinguishment of debt	0	0
Other expense	0	0
Total other income (expense)	0	0
(Income) loss in subsidiary	48,720	34,175	22,736
Net income	33,715	19,513	12,842
Preferred Stock Dividends, Income Statement Impact	(7,966)
Net Income (Loss) Available to Common Stockholders, Basic	25,749
Issuers
Revenues:
Rental income	0	0	0
Interest income	0	0	0
Total revenues	0	0	0
Expenses:
Depreciation and amortization	0	0	0
Interest	28,767	22,392	18,913
General and administrative	4	3	1
Total expenses	28,771	22,395	18,914
Other Nonoperating Income (Expense) [Abstract]
Loss on extinguishment of debt	(9,750)	0
Other expense	0	0
Total other income (expense)	(9,750)	0
(Income) loss in subsidiary	87,241	56,570	41,650
Net income	48,720	34,175	22,736
Preferred Stock Dividends, Income Statement Impact	0
Net Income (Loss) Available to Common Stockholders, Basic	48,720
Combined Guarantor Subsidiaries
Revenues:
Rental income	99,711	75,606	55,447
Interest income	5,706	1,410	3,479
Total revenues	105,417	77,016	58,926
Expenses:
Depreciation and amortization	25,664	22,061	18,144
Interest	4,444	2,724	1,333
General and administrative	1,294	1,392	4,476
Impairment		0
Total expenses	31,402	26,177	23,953
Other Nonoperating Income (Expense) [Abstract]
Loss on extinguishment of debt	(351)	0
Other expense	(800)	0
Total other income (expense)	(1,151)	0
(Income) loss in subsidiary	3,889	(3,693)	493
Net income	76,753	47,146	35,466
Preferred Stock Dividends, Income Statement Impact	0
Net Income (Loss) Available to Common Stockholders, Basic	76,753
Combined Non-Guarantor Subsidiaries
Revenues:
Rental income	29,277	26,136	25,231
Interest income	0	0	4
Total revenues	29,277	26,136	25,235
Expenses:
Depreciation and amortization	7,566	8,153	8,394
Interest	7,249	9,219	10,073
General and administrative	85	78	91
Impairment		2,481
Total expenses	14,900	19,931	18,558
Other Nonoperating Income (Expense) [Abstract]
Loss on extinguishment of debt	0	(2,670)
Other expense	0	2,196
Total other income (expense)	0	(474)
(Income) loss in subsidiary	0	0	0
Net income	14,377	5,731	6,677
Preferred Stock Dividends, Income Statement Impact	0
Net Income (Loss) Available to Common Stockholders, Basic	14,377
Elimination
Revenues:
Rental income	0	0	0
Interest income	0	0	0
Total revenues	0	0	0
Expenses:
Depreciation and amortization	0	0	0
Interest	0	0	0
General and administrative	0	0	0
Impairment		0
Total expenses	0	0	0
Other Nonoperating Income (Expense) [Abstract]
Loss on extinguishment of debt	0	0
Other expense	0	0
Total other income (expense)	0	0
(Income) loss in subsidiary	(139,850)	(87,052)	(64,879)
Net income	(139,850)	(87,052)	(64,879)
Preferred Stock Dividends, Income Statement Impact	0
Net Income (Loss) Available to Common Stockholders, Basic	$ (139,850)