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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		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenues	$ 1,060,991	$ 965,661	$ 3,164,272	$ 2,854,343
Operating Income	195,746	176,756	563,664	494,705
Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest	78,628	25,382	218,145	167,374
Income from Continuing Operations	$ 91,580	$ 28,288	$ 258,670	$ 195,946
Income (Loss) from continuing operations (in dollars per share)	$ 0.28	$ 0.10	$ 0.76	$ 0.62
Income (Loss) from continuing operations (in dollars per share)	$ 0.27	$ 0.10	$ 0.76	$ 0.62
Calculated under Revenue Guidance in Effect before Topic 606
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenues	$ 1,059,319		$ 3,158,191
Operating Income	193,578		560,561
Income from Continuing Operations	$ 76,462		$ 215,044
Income (Loss) from continuing operations (in dollars per share)	$ 0.27		$ 0.75
Income (Loss) from continuing operations (in dollars per share)	$ 0.27		$ 0.75

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