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Consolidated Statements of Comprehensive Income (Loss) (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Statement of Comprehensive Income [Abstract]        
Net income (loss) $ 2,259 $ 1,240 $ (4,762) $ (22,748)
Other comprehensive income, net of tax:        
Unrealized (loss) gain resulting from changes in fair value of marketable securities, net of tax (44) 6 (75) 9
Other comprehensive (loss) income, net of tax (44) 6 (75) 9
Comprehensive income (loss) 2,215 1,246 (4,837) (22,739)
Less: Comprehensive (loss) income attributable to noncontrolling interests (37) 160 1,189 (3,750)
Comprehensive income (loss) attributable to common stockholders $ 2,252 $ 1,086 $ (6,026) $ (18,989)