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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		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenues	$ 1,060,823	$ 949,806	$ 2,103,281	$ 1,888,682
Operating Income	203,359	170,194	367,918	317,949
Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest	93,903	83,148	139,517	141,992
Income from Continuing Operations	$ 120,308	$ 99,594	$ 167,090	$ 167,658
Income (Loss) from continuing operations (in dollars per share)	$ 0.33	$ 0.31	$ 0.49	$ 0.53
Income (Loss) from continuing operations (in dollars per share)	$ 0.33	$ 0.30	$ 0.49	$ 0.53
Calculated under Revenue Guidance in Effect before Topic 606
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenues	$ 1,057,608		$ 2,098,872
Operating Income	201,664		366,983
Income from Continuing Operations	$ 92,208		$ 138,582
Income (Loss) from continuing operations (in dollars per share)	$ 0.32		$ 0.48
Income (Loss) from continuing operations (in dollars per share)	$ 0.32		$ 0.48

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