Fair Value Measurements (Details) - USD ($) $ in Thousands	Jun. 28, 2015	Dec. 31, 2014	Jun. 29, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets (liabilities), at fair value, net	$ 25,701	$ 26,440	$ 30,110
Increase in net derivative liability	700	800	800
Designated As Hedging [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets (liabilities), at fair value, net	(18,806)	(14,649)	(11,279)
Not Designated As Hedging [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets (liabilities), at fair value, net	6,895	11,791	18,831
Current 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	6,895	11,791	0
Derivative Liability [Member] | 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	18,806	14,649	11,279
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	0	0	18,831
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	(610,372)	(605,806)	(618,904)
Reported Value Measurement [Member] | Current 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	6,895	11,791	0
Reported Value Measurement [Member] | Derivative Liability [Member] | 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	18,806	14,649	11,279
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	0	0	18,831
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	(608,850)	(608,850)	(615,825)
Notes Payable Due 2021 [Member] [Domain] | 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	(513,750)	(501,250)	(513,750)
Notes Payable Due 2021 [Member] [Domain] | 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 [Domain] | 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	(455,625)
Notes Payable Due 2024 [Domain] | 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		(451,125)	(455,625)
Notes Payable Due 2024 [Domain] | 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)
Notes Payable Due 2024 [Domain] | 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		$ (450,000)	$ (450,000)