Consolidated Statements Of Comprehensive Income (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2013		Mar. 31, 2012
Statement of Income and Comprehensive Income [Abstract]
Revenue	$ 574,686		$ 568,179
Expenses:
Direct operating	407,799	[1]	390,410	[1]
Marketing	7,957		6,957
Research and development	4,397		3,930
General and administrative	55,216		47,811
Depreciation and other	49,438		40,104
Amortization of intangible assets	2,017		687
Total expenses	526,824		489,899
Operating income	47,862		78,280
Other income (expense), net:
Income (loss) from equity method investments, net (Note 8)	(7,025)		15,159
Interest expense, net	(5,533)		(4,114)
Other, net	59		43
Total other income (expense), net	(12,499)		11,088
Income before income taxes	35,363		89,368
Income tax expense	(12,759)		(35,672)
Net income	22,604		53,696
Foreign currency translation adjustment	(1,914)	[2]	727	[2]
Comprehensive income	$ 20,690		$ 54,423
Earnings per share:
Basic earnings per share	$ 0.82		$ 1.76
Diluted earnings per share	$ 0.78		$ 1.65
Weighted average shares used in basic per share calculations	27,493		30,590
Weighted average shares used in diluted per share calculations	28,937		32,628

[1] "Direct operating" excludes depreciation and other of $33.3 million and $30.0 million for the three months ended March 31, 2013 and 2012, respectively.

[2] Foreign currency translation adjustment has no tax effect for the three months ended March 31, 2013 and 2012, respectively.