Fair Value Measurements (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt issuance costs	$ 26,000	$ 21,800
Derivative liability, current	5,100
Carrying Value \| Other current assets \| Level 1 \| Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short term investments	275	511
Carrying Value \| Derivative Liability (2) \| Level 2 \| Recurring \| Interest rate swaps
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Liability (2)	(23,237)	(6,705)
Carrying Value \| Term debt \| Long-Term Debt \| Level 2 \| Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of term debt	(721,875)	(729,375)
Carrying Value \| 2024 senior notes \| Long-Term Debt \| Level 1 \| Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of notes	(450,000)	(450,000)
Carrying Value \| 2027 senior notes \| Long-Term Debt \| Level 1 \| Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of notes	(500,000)	(500,000)
Carrying Value \| 2029 senior notes \| Long-Term Debt \| Level 2 \| Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of notes	(500,000)	0
Fair Value \| Other current assets \| Level 1 \| Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short term investments	275	511
Fair Value \| Derivative Liability (2) \| Level 2 \| Recurring \| Interest rate swaps
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Liability (2)	(23,237)	(6,705)
Fair Value \| Term debt \| Long-Term Debt \| Level 2 \| Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of term debt	(725,484)	(707,494)
Fair Value \| 2024 senior notes \| Long-Term Debt \| Level 1 \| Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of notes	(462,375)	(441,000)
Fair Value \| 2027 senior notes \| Long-Term Debt \| Level 1 \| Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of notes	(535,000)	(475,000)
Fair Value \| 2029 senior notes \| Long-Term Debt \| Level 2 \| Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of notes	$ (539,375)	$ 0

Amount, after accumulated amortization, of debt issuance costs classified as noncurrent. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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Fair values as of the balance sheet date of the net amount of all assets and liabilities resulting from contracts that meet the criteria of being accounted for as derivative instruments.

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The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

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Amount of investment in debt security measured at fair value with change in fair value recognized in net income (trading) and investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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