Stockholders' Equity (Details 2) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Weighted average Common Shares outstanding
Weighted average Common Shares outstanding	77,977,278	73,476,473	77,961,391	70,550,070
Unvested restricted stock	(1,515,012)	(1,441,319)	(1,516,904)	(1,440,527)
Weighted average Common Shares - Basic	76,462,266	72,035,154	76,444,487	69,109,543
Dilutive effect of restricted stock	1,127,522	1,045,698	1,108,456	0
Dilutive effect of employee stock purchase plan	122,705	68,380	125,419	0
Weighted average Common Shares Outstanding - Diluted	77,712,493	73,149,232	77,678,362	69,109,543
Net income (Loss)
Income (loss) from continuing operations	$ 2,433	$ 1,292	$ 4,190	$ (5,088)
Less: Net income attributable to noncontrolling interests	(20)	0	(20)	(27)
Income (loss) from continuing operations attributable to common shareholders	2,413	1,292	4,170	(5,115)
Discontinued operations	495	719	1,872	1,337
NET INCOME (LOSS) ATTRIBUTABLE TO COMMON STOCKHOLDERS	$ 2,908	$ 2,011	$ 6,042	$ (3,778)
Basic Earnings (Loss) Per Common Share
Income (loss) from continuing operations	$ 0.03	$ 0.02	$ 0.05	$ (0.07)
Discontinued operations	$ 0.01	$ 0.01	$ 0.03	$ 0.02
Net income (loss) attributable to common stockholders	$ 0.04	$ 0.03	$ 0.08	$ (0.05)
Diluted Earnings (Loss) Per Common Share
Income (loss) from continuing operations	$ 0.03	$ 0.02	$ 0.05	$ (0.07)
Discontinued operations	$ 0.01	$ 0.01	$ 0.03	$ 0.02
Net income (loss) attributable to common stockholders	$ 0.04	$ 0.03	$ 0.08	$ (0.05)