CONSOLIDATED STATEMENTS OF SHAREHOLDER'S EQUITY (USD $) In Thousands, except Share data, unless otherwise specified	Total USD ($)	Common Stock	Additional Paid-In Capital USD ($)	Retained Earnings USD ($)	Accumulated Other Comprehensive Income/(Loss) USD ($)	Noncontrolling Interests USD ($)
Balance at Dec. 31, 2010	$ 242,613		$ 236,726	$ 5,448	$ 257	$ 182
Balance (in shares) at Dec. 31, 2010		21,345,000
Increase (Decrease) in Stockholders' Equity
Net income (loss)	52,992			53,163		(171)
Foreign currency translation adjustment arising during period	(433)				(433)
Share-based compensation	2,383		2,383
Funds contributed by co-investors	1,400		1,400
Balance at Dec. 31, 2011	298,955		240,509	58,611	(176)	11
Balance (in shares) at Dec. 31, 2011		21,345,000
Increase (Decrease) in Stockholders' Equity
Net income (loss)	41,013			41,123		(110)
Foreign currency translation adjustment arising during period	206				206
Share-based compensation	3,836		3,836
Balance at Dec. 31, 2012	344,010		244,345	99,734	30	(99)
Balance (in shares) at Dec. 31, 2012	21,344,741	21,345,000
Increase (Decrease) in Stockholders' Equity
Net income (loss)	49,773			49,883		(110)
Foreign currency translation adjustment arising during period	(579)				(579)
Acquisition of remaining noncontrolling interest during period			(209)			209
Share-based compensation	2,917		2,917
Balance at Dec. 31, 2013	$ 396,121		$ 247,053	$ 149,617	$ (549)
Balance (in shares) at Dec. 31, 2013	21,344,741	21,345,000