Supplemental Cash Flow Disclosure (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended	6 Months Ended				1 Months Ended	6 Months Ended
	Mar. 31, 2011	Jun. 30, 2012	Jun. 30, 2011	May 31, 2011	Jan. 31, 2011	Jan. 31, 2011 Common Stock [Member]	Jun. 30, 2012 Common Stock [Member]	Jun. 30, 2012 Additional paid-in capital [Member]	Jun. 30, 2011 Additional paid-in capital [Member]	Jun. 30, 2012 Accumulated other comprehensive income (loss) [Member]	Jun. 30, 2011 Accumulated other comprehensive income (loss) [Member]	Jun. 30, 2012 Non-controlling Interest [Member]	Jun. 30, 2011 Non-controlling Interest [Member]	Jun. 30, 2012 Total stockholder's equity [Member]
Supplemental cash flow disclosure (Textual) [Abstract]
Interest paid		$ 2,721	$ 2,878
Paid income taxes		111	56
Received income tax refunds		0	105
Ratio of Common Stock to membership units		1
Shares of star Asia	54,452
Transferred shares							186,339
Shares transferred of Star Asia	476
Acquisition / (surrender) of additional units of consolidated subsidiary, net		828	972					828	972	(28)	(27)	(800)	(945)	800
Reclassification of redeemable non-controlling interest to mandatorily redeemable equity interests		6,071	3,536
Net assets					16,813
Cash consideration					14,956
Shares consideration						313,051
Value of stock consideration					1,531
Contingent payments					326
Acquisition contribution				45,000
Percentage of ownership interest not owned by parent				30.00%
Percentage of membership interests				70.00%
Acquisition of PrinceRidge				$ 18,502