Unaudited Condensed Consolidated Statements of Stockholders' Equity - 6 months ended Jun. 30, 2016 - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	AOCI Attributable to Parent	Treasury Stock	Noncontrolling Interest
Beginning Balance at Dec. 31, 2015	$ 694,905	$ 80	$ 974,264	$ 514,761	$ (60,893)	$ (837,179)	$ 103,872
Beginning Balance (in shares) at Dec. 31, 2015		80,609
Shares issued on vesting of restricted stock (in shares)		247
Shares issued on vesting of restricted stock	1	$ 1
Shares repurchased on vesting of restricted stock and exercise of stock options	(540)					(540)
Tax deficiency of stock option exercises and restricted stock vestings	(1,596)		(1,596)
Compensation expense in connection with restricted stock and stock options	3,489		3,489
Payments from non-controlling interest holders, net of imputed interest	336						336
Change in redemption value of redeemable non-controlling interest	(2,500)			(2,500)
Change in fair value of available for sale securities	(2,227)				(2,227)
Shares issued on repurchase of convertible notes	24,323	$ 3	24,320
Shares issued on repurchase of convertible notes (in shares)		3,467
Repurchase of equity portion of convertible notes	(147)		(147)
Net income	40,192			30,195			9,997
Tax effect of repurchase of convertible notes	52		52
Tax benefit related to amortization of convertible notes' discount	170		170
Foreign currency translation	4,956				4,956
Distributions to joint ventures	(13,644)						(13,644)
Ending Balance at Jun. 30, 2016	$ 747,770	$ 84	$ 1,000,552	$ 542,456	$ (58,164)	$ (837,719)	$ 100,561
Ending Balance (in shares) at Jun. 30, 2016		84,323