Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Income Statement [Abstract]
Revenues	$ 924,676	$ 686,649	$ 2,669,342	$ 1,995,405
Costs and operating expenses:
Cost of revenues	470,302	325,468	1,354,949	939,538
Sales and marketing	110,936	83,709	325,358	243,573
General and administrative	181,239	123,237	515,605	356,455
Acquisition costs	12,505	13,352	64,635	24,374
Impairment charges	7,698	0	7,698	0
Gains on asset sales	(27,945)	0	(33,187)	0
Total costs and operating expenses	754,735	545,766	2,235,058	1,563,940
Income from continuing operations	169,941	140,883	434,284	431,465
Interest income	762	934	2,528	2,375
Interest expense	(92,200)	(76,269)	(293,395)	(219,556)
Other income (expense)	2,938	(12,836)	(56,217)	(11,964)
Loss on debt extinguishment	(9,894)	0	(10,499)	0
Income from continuing operations before income taxes	71,547	52,712	76,701	202,320
Income tax expense	(22,778)	(11,580)	(25,957)	(25,277)
Net income from continuing operations	48,769	41,132	50,744	177,043
Net income from discontinued operations, net of tax	2,681	0	14,306	0
Net income	$ 51,450	$ 41,132	$ 65,050	$ 177,043
Earnings per share (“EPS”):
Basic EPS from continuing operations (in dollars per share)	$ 0.69	$ 0.72	$ 0.73	$ 3.11
Basic EPS from discontinued operations (in dollars per share)	0.04	0.00	0.21	0.00
Basic EPS (in dollars per share)	$ 0.73	$ 0.72	$ 0.94	$ 3.11
Weighted-average shares	71,190	57,082	69,689	56,894
Diluted EPS from continuing operations (in dollars per share)	$ 0.68	$ 0.71	$ 0.72	$ 3.08
Diluted EPS from discontinued operations (in dollars per share)	0.04	0.00	0.20	0.00
Diluted EPS (in dollars per share)	$ 0.72	$ 0.71	$ 0.92	$ 3.08
Weighted-average shares for diluted EPS	71,908	57,708	70,389	57,521