Senior Unsecured Notes (Narrative) (Details) - USD ($)
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12 Months Ended |
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Dec. 28, 2016 |
Sep. 19, 2016 |
Dec. 31, 2016 |
Dec. 31, 2014 |
Nov. 29, 2016 |
Dec. 31, 2015 |
| Debt Instrument [Line Items] |
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| Principal balance outstanding |
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$ 2,340,009,000
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$ 2,145,393,000
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| Repayments of senior unsecured notes |
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448,339,000
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$ 350,000,000
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| Loss from extinguishment of debt, net |
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$ 30,540,000
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$ 582,000
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| 7.750% Senior Unsecured Notes, Due August 15, 2019 [Member] |
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| Debt Instrument [Line Items] |
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| Face amount of senior unsecured notes |
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$ 114,900,000
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| Redemption percentage of notes |
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115.314%
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115.977%
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| Interest rate of senior unsecured notes |
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7.75%
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| Maturity date of the senior unsecured notes |
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Aug. 15, 2019
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| Repayments of senior unsecured notes |
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$ 159,700,000
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$ 134,100,000
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| Redeemed cash for outstanding principal amount |
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$ 135,100,000
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| Loss from extinguishment of debt, net |
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$ 40,700,000
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| Unsecured Note [Member] |
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| Debt Instrument [Line Items] |
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| Principal balance outstanding |
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$ 825,000,000
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1,275,000,000
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| Unsecured Note [Member] | 7.750% Senior Unsecured Notes, Due August 15, 2019 [Member] |
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| Debt Instrument [Line Items] |
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| Principal balance outstanding |
[1] |
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$ 250,000,000
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