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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
	Mar. 31, 2018	Mar. 31, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenues	$ 1,042,458	$ 938,876
Operating Income	164,559	147,755
Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest	45,614	58,844
Income from Continuing Operations	$ 46,782	$ 68,064
Income (Loss) from continuing operations (in dollars per share)	$ 0.16	$ 0.22
Income (Loss) from continuing operations (in dollars per share)	$ 0.16	$ 0.22
Calculated under Revenue Guidance in Effect before Topic 606
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenues	$ 1,041,264
Operating Income	165,319
Income from Continuing Operations	$ 46,374
Income (Loss) from continuing operations (in dollars per share)	$ 0.16
Income (Loss) from continuing operations (in dollars per share)	$ 0.16

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Sum of operating profit and nonoperating income or expense before income taxes, extraordinary items, noncontrolling interest and (gain) loss from disposition of real estate.

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Amount after tax of income (loss) from continuing operations including portion attributable to the noncontrolling interest.

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