Fair Value Measurements (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018	Mar. 25, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Deferred finance costs	$ 20,925	$ 21,807	$ 24,218
Derivative Liability [Member] \| Level 2 [Member] \| Fair Value, Measurements, Recurring [Member] \| Interest Rate Swap [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets (liabilities), at fair value, net	(13,083)	(6,705)	(2,730)
Reported Value Measurement [Member] \| Derivative Liability [Member] \| Level 2 [Member] \| Fair Value, Measurements, Recurring [Member] \| Interest Rate Swap [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets (liabilities), at fair value, net	(13,083)	(6,705)	(2,730)
2017 Credit Agreement [Member] \| Long-term Debt [Member] \| Level 2 [Member] \| Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of term debt	(723,863)	(707,494)	(740,513)
2017 Credit Agreement [Member] \| Reported Value Measurement [Member] \| Long-term Debt [Member] \| Level 2 [Member] \| Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of term debt	(727,500)	(729,375)	(735,000)
April 2017 Notes [Member] \| Long-term Debt [Member] \| Level 1 [Member] \| Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of notes	(505,000)	(475,000)	(494,375)
April 2017 Notes [Member] \| Reported Value Measurement [Member] \| Long-term Debt [Member] \| Level 1 [Member] \| Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of notes	(500,000)	(500,000)	(500,000)
Notes Payable due 2024 [Member] \| Long-term Debt [Member] \| Level 1 [Member] \| Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of notes	(457,875)	(441,000)	(455,625)
Notes Payable due 2024 [Member] \| Reported Value Measurement [Member] \| Long-term Debt [Member] \| Level 1 [Member] \| Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of notes	(450,000)	(450,000)	(450,000)
Short-term Investments [Member] \| Other Current Assets [Member] \| Level 1 [Member] \| Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, fair value	492	511	901
Short-term Investments [Member] \| Reported Value Measurement [Member] \| Other Current Assets [Member] \| Level 1 [Member] \| Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, fair value	$ 492	$ 511	$ 901

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

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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