Summary of Significant Accounting Policies (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2019 USD ($) segment	Jan. 01, 2019 USD ($)	Dec. 31, 2018 USD ($)
Accounting Policies [Abstract]
Number of Operating Segments \| segment	1
New Accounting Pronouncements or Change in Accounting Principle
Prepaid expenses and other current assets	$ 172,498	$ 154,634	$ 155,012
Operating lease right-of-use assets	217,796	210,914	0
Other long-term assets	56,446	50,899	50,927
Other accrued liabilities	72,457	70,396	55,896
Operating lease liabilities	251,904	242,916	0
Other long-term liabilities	$ 11,232	9,349	$ 56,257
Prepaid expenses and other current assets \| Accounting Standards Update 2016-02
New Accounting Pronouncements or Change in Accounting Principle
Cumulative Effect of New Accounting Principle in Period of Adoption		(378)
Operating lease right-of-use assets \| Accounting Standards Update 2016-02
New Accounting Pronouncements or Change in Accounting Principle
Cumulative Effect of New Accounting Principle in Period of Adoption		210,914
Other long-term assets \| Accounting Standards Update 2016-02
New Accounting Pronouncements or Change in Accounting Principle
Cumulative Effect of New Accounting Principle in Period of Adoption		(28)
Other accrued liabilities \| Accounting Standards Update 2016-02
New Accounting Pronouncements or Change in Accounting Principle
Cumulative Effect of New Accounting Principle in Period of Adoption		14,500
Operating lease liabilities \| Accounting Standards Update 2016-02
New Accounting Pronouncements or Change in Accounting Principle
Cumulative Effect of New Accounting Principle in Period of Adoption		242,916
Other long-term liabilities \| Accounting Standards Update 2016-02
New Accounting Pronouncements or Change in Accounting Principle
Cumulative Effect of New Accounting Principle in Period of Adoption		$ (46,908)

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