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Summary of Significant Accounting Policies - Revenue - Summary of Condensed Consolidated Statements of Operations (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenues	$ 1,061,489	$ 1,060,991	$ 1,060,823	$ 1,042,458	$ 991,235	$ 965,661	$ 949,806	$ 938,876	$ 4,225,761	$ 3,845,578	$ 3,511,453
Operating income (loss)	191,844	195,746	203,359	164,559	154,405	176,756	170,194	147,755	755,508	649,109	501,606
Income from Continuing Operations	$ 158,831	$ 78,628	$ 93,903	$ 45,614	$ 24,349	$ 25,382	$ 83,148	$ 58,844	$ 376,976	$ 191,723	$ 103,880
Income (Loss) from Continuing Operations (in dollars per share)	$ 0.55	$ 0.28	$ 0.33	$ 0.16	$ 0.09	$ 0.10	$ 0.31	$ 0.22	$ 1.31	$ 0.71	$ 0.41
Income (Loss) from Continuing Operations - Diluted (in dollars per share)	$ 0.55	$ 0.27	$ 0.33	$ 0.16	$ 0.09	$ 0.10	$ 0.30	$ 0.22	$ 1.31	$ 0.71	$ 0.41
Calculated under Revenue Guidance in Effect before Topic 606 [Member]
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenues									$ 4,219,663
Operating income (loss)									751,648
Income from Continuing Operations									$ 373,113
Income (Loss) from Continuing Operations (in dollars per share)									$ 1.30
Income (Loss) from Continuing Operations - Diluted (in dollars per share)									$ 1.30

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