Condensed Consolidated Statement of Stockholders' Equity (USD $) In Thousands, except Share data	Total	Common stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Gain	Treasury Stock	Non-Controlling Interest
Beginning Balance at Dec. 31, 2010	$ 1,138,914	$ 74	$ 752,803	$ 294,316		$ (10,831)	$ 102,552
Beginning Balance (in shares) at Dec. 31, 2010		73,930,000
Shares issued on exercise of stock options (in shares)	213,385	213,000
Shares issued on exercise of stock options	1,519		1,519
Shares issued on vesting of restricted stock		181,000
Shares issued for earn-out on acquisition (in shares)		144,000
Shares issued for earn-out on acquisition	427		427
Tax benefit of stock option exercises	910		910
Compensation expense in connection with restricted stock and stock options	4,946		4,946
Cost of shares repurchased on vesting of restricted stock and exercise of stock options	(2,447)					(2,447)
Equity portion of convertible notes	33,875		33,875
Net cost of hedge on convertible notes	(9,374)		(9,374)
Comprehensive income:
Net income	79,972			72,975			6,997
Change in fair value of hedges
Total comprehensive income	79,972
Distributions to joint ventures	(6,983)						(6,983)
Non-controlling interest of acquired companies	14,930						14,930
Ending Balance at Jun. 30, 2011	$ 1,256,689	$ 74	$ 785,106	$ 367,291		$ (13,278)	$ 117,496
Ending Balance (in shares) at Jun. 30, 2011		74,468,000