Fair Value Measurements (Details) - USD ($) $ in Thousands	Sep. 24, 2017	Dec. 31, 2016	Sep. 25, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Deferred finance costs	$ 25,374	$ 15,864	$ 16,979
Derivative Liability [Member] | Not Designated As Hedging [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	(14,849)	(17,721)	(30,185)
Reported Value Measurement [Member] | Derivative Liability [Member] | Not Designated As Hedging [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	(14,849)	(17,721)	(30,185)
Credit Agreement 2013 [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	0	(603,075)	(603,154)
Credit Agreement 2013 [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	0	(600,075)	(601,650)
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	(740,513)	0	0
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	(735,000)	0	0
Notes Payable Due 2021 [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	0	(510,000)	(520,000)
Notes Payable Due 2021 [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	0	(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	(472,500)	(462,375)	(477,000)
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)
April 2017 Notes [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 notes	(527,500)	0	0
April 2017 Notes [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 notes	(500,000)	0	0
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	688	0	0
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	$ 688	$ 0	$ 0