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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, 2019	Mar. 31, 2018
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenues	$ 1,053,863	$ 1,042,458
Operating Income	158,675	164,559
Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest	30,476	45,614
Income from Continuing Operations	$ 41,029	$ 46,782
Income (Loss) from continuing operations (in dollars per share)	$ 0.10	$ 0.16
Income (Loss) from continuing operations (in dollars per share)	$ 0.10	$ 0.16

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