Unaudited Condensed Consolidated Statements of Stockholders' Equity - 6 months ended Jun. 30, 2015 - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	AOCI Attributable to Parent	Treasury Stock	Noncontrolling Interest
Beginning Balance at Dec. 31, 2014	$ 951,437	$ 79	$ 940,922	$ 713,819	$ (24,186)	$ (812,429)	$ 133,232
Beginning Balance (in shares) at Dec. 31, 2014		79,263,000
Issuance of common stock related to acquisition of interest in joint venture (in shares)		465,000
Issuance of common stock related to acquisition of interest in joint venture	15,703		15,703
Shares issued on vesting of restricted stock (in shares)		596,000
Shares issued on vesting of restricted stock	$ 1	$ 1
Shares issued on exercise of stock options and warrants (in shares)	15,000	15,000
Shares issued on exercise of stock options and warrants	$ 245		245
Tax benefit of stock option exercises	54		54
Compensation expense in connection with restricted stock	5,888		5,888
Shares repurchased cost method	(12,391)					(12,391)
Cost of shares repurchased on vesting of restricted stock and exercise of stock options	(11,681)					(11,681)
Change in non-controlling interest, net of imputed interest	3,185						3,185
Change in redemption value of redeemable non-controlling interest, net of imputed interest	(2,499)			(2,499)
Change in fair value of available for sale securities	299				299
Net income	88,000			79,098			8,902
Foreign currency translation	(30,610)				(30,610)
Distributions to joint ventures	(9,016)						(9,016)
Non-controlling interest of acquired companies	12,333						12,333
Ending Balance at Jun. 30, 2015	$ 1,010,948	$ 80	$ 962,812	$ 790,418	$ (54,497)	$ (836,501)	$ 148,636
Ending Balance (in shares) at Jun. 30, 2015		80,339,000