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The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income, net of any cash received during the current period as refunds for the overpayment of taxes.

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Amount of cash paid for interest, excluding capitalized interest, classified as operating activity. Includes, but is not limited to, payment to settle zero-coupon bond for accreted interest of debt discount and debt instrument with insignificant coupon interest rate in relation to effective interest rate of borrowing attributable to accreted interest of debt discount.

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Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018	Dec. 31, 2017
Condensed Cash Flow Statements, Captions [Line Items]
Cash and cash equivalents	$ 29,268		$ 24,503		$ 29,268	$ 24,503	$ 135,862	$ 98,801
Cash, cash equivalents and restricted cash	29,268		24,503		29,268	24,503	135,862	128,041
Supplemental Cash Flow Information [Abstract]
Cash paid for income taxes, net of refunds 1					55,785	37,013
Cash paid for interest					85,961	91,360
Net tax payments	56,200		39,800
Net refunds received		$ 400		$ 2,800
Prepaid expenses and other current assets
Condensed Cash Flow Statements, Captions [Line Items]
Restricted cash equivalents	$ 0		$ 0		$ 0	$ 0	$ 0	$ 29,240