Earnings Per Share (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2010	Jun. 30, 2010	Mar. 31, 2010	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Weighted Average Common Shares
Weighted average Common Shares outstanding									74,156,849	63,038,663	59,385,018
Unvested restricted stock									(1,436,702)	(1,315,877)	(1,185,426)
Weighted average Common Shares - Basic									72,720,147	61,722,786	58,199,592
Dilutive effect of restricted stock										979,260	790,291
Dilutive effect of employee stock purchase plan										68,780	57,431
Weighted average Common Shares - Diluted									72,720,147	62,770,826	59,047,314
Net income (Loss)
Income (loss) from continuing operations	$ 1,633	$ 116	$ 1,438	$ (6,244)	$ (384)	$ (1,865)	$ 4,089	$ 248	$ (3,057)	$ 2,088	$ 23,264
Less: Net income attributable to noncontrolling interests		(3)		(27)	(2)	59	(40)	(64)	(30)	(47)	(57)
Income (loss) from continuing operations attributable to common shareholders									(3,087)	2,041	23,207
Discontinued operations	1,284	534	573	482	766	(1,442)	2,425	4,410	2,873	6,159	27,884
NET INCOME (LOSS) ATTRIBUTABLE TO COMMON STOCKHOLDERS	$ 2,917	$ 647	$ 2,011	$ (5,789)	$ 380	$ (3,248)	$ 6,474	$ 4,594	$ (214)	$ 8,200	$ 51,091
Basic Earnings (Loss) Per Common Share
Income (loss) from continuing operations	$ 0.02		$ 0.02	$ (0.10)	$ (0.01)	$ (0.03)	$ 0.07		$ (0.04)	$ 0.03	$ 0.40
Discontinued operations	$ 0.02	$ 0.01	$ 0.01	$ 0.01	$ 0.02	$ (0.02)	$ 0.04	$ 0.08	$ 0.04	$ 0.10	$ 0.48
Net income (loss) attributable to common stockholders	$ 0.04	$ 0.01	$ 0.03	$ (0.09)	$ 0.01	$ (0.05)	$ 0.11	$ 0.08	$ 0.00	$ 0.13	$ 0.88
Diluted Earnings (Loss) Per Common Share
Income (loss) from continuing operations	$ 0.02		$ 0.02	$ (0.10)	$ (0.01)	$ (0.03)	$ 0.07		$ (0.04)	$ 0.03	$ 0.39
Discontinued operations	$ 0.02	$ 0.01	$ 0.01	$ 0.01	$ 0.02	$ (0.02)	$ 0.03	$ 0.08	$ 0.04	$ 0.10	$ 0.48
Net income (loss) attributable to common stockholders	$ 0.04	$ 0.01	$ 0.03	$ (0.09)	$ 0.01	$ (0.05)	$ 0.10	$ 0.08	$ 0.00	$ 0.13	$ 0.87