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Debt (Details) - USD ($) |  |  |  |  | 3 Months Ended | 9 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Nov. 01, 2016 | Aug. 29, 2016 | Nov. 26, 2013 | May 08, 2013 | Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015 | Mar. 30, 2016 | Dec. 31, 2015 | May 15, 2015 | Aug. 15, 2013 | Oct. 22, 2012
Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred financing costs |  |  |  |  | $ (9,312,000) |  | $ (9,312,000) |  |  | $ (6,616,000) |  |  |
Total debt |  |  |  |  | 581,574,000 |  | 581,574,000 |  |  | 344,589,000 |  |  |
Current portion of long-term debt, including premium and deferred financing costs |  |  |  |  | (114,342,000) |  | (114,342,000) |  |  | 0 |  |  |
Long-term debt |  |  |  |  | 467,232,000 |  | 467,232,000 |  |  | 344,589,000 |  |  |
Senior Notes [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Loss on extinguishment of debt |  |  |  |  | (9,525,000) | $ 0 | (9,525,000) | $ 0 |  |  |  |  |
Current portion of long-term debt |  |  |  |  | 114,342,000 |  | 114,342,000 |  |  | 0 |  |  |
Restricted cash deposits with trustee |  |  |  |  | 122,856,000 |  | 122,856,000 |  |  | 0 |  |  |
Interest paid |  |  |  |  |  |  | 16,200,000 | $ 10,600,000 |  |  |  |  |
Medium-term notes [Member] | Term Loan Due 2022 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Total debt |  |  |  |  | 50,000,000 |  | $ 50,000,000 |  |  | 50,000,000 |  |  |
Term Loan [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Term Loan, Face Amount |  |  |  |  |  |  |  |  |  |  | $ 50,000,000 |  |
Term Loan, Average Interest Rate During Period |  |  |  |  |  |  | 2.20% |  |  |  |  |  |
Term Loan, Average Interest Rate During Period With Patronage Credits |  |  |  |  |  |  | 1.50% |  |  |  |  |  |
Senior Notes [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Senior Notes, Face Amount |  |  |  |  |  |  |  |  |  |  | $ 50,000,000 |  |
Medium-term notes [Member] | Term Loan Due 2022 [Member] | London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Term Loan [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable interest rate |  |  |  |  |  |  | 1.75% |  |  |  |  |  |
Medium-term notes [Member] | Term Loan Due 2022 [Member] | London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Term Loan [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable interest rate |  |  |  |  |  |  | 2.25% |  |  |  |  |  |
Medium-term notes [Member] | Term Loan Due 2022 [Member] | Base Rate [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Term Loan [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable interest rate |  |  |  |  |  |  | 0.75% |  |  |  |  |  |
Medium-term notes [Member] | Term Loan Due 2022 [Member] | Base Rate [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Term Loan [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable interest rate |  |  |  |  |  |  | 1.25% |  |  |  |  |  |
Medium-term notes [Member] | Term Loan Due 2026 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Total debt |  |  |  |  | 75,000,000 |  | $ 75,000,000 |  |  | 0 |  |  |
Term Loan [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Term Loan, Face Amount |  |  |  |  |  |  |  |  | $ 75,000,000 |  |  |  |
Long-term Debt, Maturities, Repayments of Principal after Year Five |  |  |  |  | $ 10,000,000 |  | $ 10,000,000 |  |  |  |  |  |
Debt Instrument, Covenant, Capitalization Ratio, Maximum (as a percent) |  |  |  |  | 60.00% |  | 60.00% |  |  |  |  |  |
Debt Instrument, Covenant, Consolidated Net Worth, Minimum |  |  |  |  | $ 350,000,000 |  | $ 350,000,000 |  |  |  |  |  |
Debt Instrument, Covenant, Available Liquidity, Minimum |  |  |  |  | 100,000,000 |  | 100,000,000 |  |  |  |  |  |
Threshold of amount of capital expenditures made during four consecutive quarters, maximum |  |  |  |  | 50,000,000 |  | $ 50,000,000 |  |  |  |  |  |
Term Loan, Average Interest Rate During Period |  |  |  |  |  |  | 2.34% |  |  |  |  |  |
Term Loan, Average Interest Rate During Period With Patronage Credits |  |  |  |  |  |  | 1.60% |  |  |  |  |  |
Senior Notes [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Senior Notes, Face Amount |  |  |  |  |  |  |  |  | $ 75,000,000 |  |  |  |
Medium-term notes [Member] | Term Loan Due 2026 [Member] | London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Term Loan [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable interest rate |  |  |  |  |  |  | 1.875% |  |  |  |  |  |
Medium-term notes [Member] | Term Loan Due 2026 [Member] | London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Term Loan [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable interest rate |  |  |  |  |  |  | 2.125% |  |  |  |  |  |
Medium-term notes [Member] | Term Loan Due 2026 [Member] | Base Rate [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Term Loan [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable interest rate |  |  |  |  |  |  | 0.875% |  |  |  |  |  |
Medium-term notes [Member] | Term Loan Due 2026 [Member] | Base Rate [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Term Loan [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable interest rate |  |  |  |  |  |  | 1.125% |  |  |  |  |  |
Senior notes [Member] | 6.375% Senior Notes Due 2020 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Unamortized premium on 6.375% senior notes |  |  |  |  | 393,000 |  | $ 393,000 |  |  | 1,215,000 |  |  |
Total debt |  |  |  |  | 115,493,000 |  | 115,493,000 |  |  | 299,990,000 |  |  |
Current portion of long-term debt, including premium and deferred financing costs |  | $ (115,500,000) |  |  |  |  |  |  |  |  |  |  |
Term Loan [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Term Loan, Face Amount |  | 300,000,000 |  |  |  |  |  |  |  |  |  |  |
Senior Notes [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Senior Notes, Face Amount |  | 300,000,000 |  |  |  |  |  |  |  |  |  |  |
Extinguishment of Debt, Amount |  | 184,500,000 |  |  |  |  |  |  |  |  |  |  |
Loss on extinguishment of debt |  | (9,500,000) |  |  |  |  |  |  |  |  |  |  |
Tender premium paid for redemption of debt |  | (7,600,000) |  |  |  |  |  |  |  |  |  |  |
Net write-off of unamortized deferred financing costs and unamortized premium |  | (1,900,000) |  |  |  |  |  |  |  |  |  |  |
Current portion of long-term debt |  | 115,500,000 |  |  |  |  |  |  |  |  |  |  |
Restricted cash deposits with trustee |  | 122,900,000 |  |  |  |  |  |  |  |  |  |  |
Senior notes [Member] | 6.375% Senior Notes Due 2020 [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Senior Notes [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Loss on extinguishment of debt | $ (4,800,000) |  |  |  |  |  |  |  |  |  |  |  |
Tender premium paid for redemption of debt | (3,700,000) |  |  |  |  |  |  |  |  |  |  |  |
Net write-off of unamortized deferred financing costs and unamortized premium | $ (1,100,000) |  |  |  |  |  |  |  |  |  |  |  |
2020 Notes, Redemption Period, End Date | Nov. 01, 2016 |  |  |  |  |  |  |  |  |  |  |  |
Senior notes [Member] | 250 million original new 6.375% Senior Notes due 2020 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Senior Notes [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  | 6.375% |  |  |  |  |  |  |  |  |
Debt Exchange, Original Debt, Amount |  |  |  | $ 250,000,000 |  |  |  |  |  |  |  |  |
Percentage of Senior Notes tendered and accepted for exchange |  |  |  | 100.00% |  |  |  |  |  |  |  |  |
Senior notes [Member] | 50 million additional new 6.375% Senior Notes due 2020 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Senior Notes [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  | 6.375% |  |  |  |  |  |  |  |  |  |
Debt Exchange, Original Debt, Amount |  |  | $ 49,990,000 |  |  |  |  |  |  |  |  |  |
Percentage of Senior Notes tendered and accepted for exchange |  |  | 99.98% |  |  |  |  |  |  |  |  |  |
Senior notes [Member] | $250 million original 6.375% Senior Notes due 2020 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Term Loan [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Term Loan, Face Amount |  |  |  |  |  |  |  |  |  |  |  |  | $ 250,000,000
Senior Notes [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Senior Notes, Face Amount |  |  |  |  |  |  |  |  |  |  |  |  | $ 250,000,000
Interest rate |  |  |  |  |  |  |  |  |  |  |  |  | 6.375%
Senior notes [Member] | 50 million additional old 6.375% Senior Notes due 2020 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Term Loan [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Term Loan, Face Amount |  |  |  |  |  |  |  |  |  |  |  | $ 50,000,000 |
Senior Notes [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Senior Notes, Face Amount |  |  |  |  |  |  |  |  |  |  |  | $ 50,000,000 |
Premium rate on 6.375% senior notes |  |  |  |  |  |  |  |  |  |  |  | 103.50% |
Senior notes [Member] | 5.625% Senior Notes Due 2024 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Total debt |  |  |  |  | $ 350,000,000 |  | $ 350,000,000 |  |  | $ 0 |  |  |
Term Loan [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Term Loan, Face Amount |  | 350,000,000 |  |  |  |  |  |  |  |  |  |  |
Senior Notes [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Senior Notes, Face Amount |  | $ 350,000,000 |  |  |  |  |  |  |  |  |  |  |
Interest rate |  | 5.625% |  |  |  |  |  |  |  |  |  |  |

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- Definition Amount after unamortized (discount) premium and debt issuance costs of long-term debt classified as noncurrent and excluding amounts to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The carrying amounts of cash and cash equivalent items which are restricted as to withdrawal or usage. Restrictions may include legally restricted deposits held as compensating balances against short-term borrowing arrangements, contracts entered into with others, or entity statements of intention with regard to particular deposits; however, time deposits and short-term certificates of deposit are not generally included in legally restricted deposits. Excludes compensating balance arrangements that are not agreements which legally restrict the use of cash amounts shown on the balance sheet. For a classified balance sheet represents the current portion only (the noncurrent portion has a separate concept); there is a separate and distinct element for unclassified presentations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Write-off of amounts previously capitalized as debt issuance cost in an extinguishment of debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.8) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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