Condensed Consolidated Statements of Operations (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Income Statement [Abstract]
Revenues	$ 550,401	$ 448,665	$ 1,507,448	$ 1,281,862
Expenses:
Cost of revenues (exclusive of items shown separately below)	210,167	180,873	589,579	523,016
Selling, general and administrative	79,310	56,164	228,908	170,372
Depreciation and amortization of fixed assets	33,501	21,951	86,571	62,455
Amortization of intangible assets	18,543	14,187	61,496	42,620
Total expenses	341,521	273,175	966,554	798,463
Operating income	208,880	175,490	540,894	483,399
Other income (expense):
Investment income and others, net	17,912	(285)	17,153	(76)
Gain on derivative instruments	0	0	85,187	0
Interest expense	(33,003)	(17,498)	(88,927)	(52,396)
Total other (expense) income, net	(15,091)	(17,783)	13,413	(52,472)
Income before income taxes	193,789	157,707	554,307	430,927
Provision for income taxes	(61,975)	(58,692)	(160,487)	(159,372)
Income from continuing operations	131,814	99,015	393,820	271,555
Income from discontinued operations, net of tax of $0 and $23,365, for the three and nine months ended September 30, 2014, respectively (Note 6)	0	0	0	31,117
Net income	$ 131,814	$ 99,015	$ 393,820	$ 302,672
Basic net income per share:
Income from continuing operations (in dollars per share)	$ 0.78	$ 0.60	$ 2.41	$ 1.63
Income from discontinued operations (in dollars per share)	0.00	0.00	0.00	0.19
Basic net income per share (in dollars per share)	0.78	0.60	2.41	1.82
Diluted net income per share:
Income from continuing operations (in dollars per share)	0.77	0.58	2.36	1.60
Income from discontinued operations (in dollars per share)	0.00	0.00	0.00	0.18
Diluted net income per share (in dollars per share)	$ 0.77	$ 0.58	$ 2.36	$ 1.78
Weighted average shares outstanding:
Basic (in shares)	168,739,437	166,187,540	163,656,387	166,504,384
Diluted (in shares)	172,171,337	169,522,448	167,079,550	169,815,867