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Long-Term Debt Debt Maturity Schedule (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Debt Instrument [Line Items] |  |
Long-term Debt | $ 2,724,672 | $ 2,705,718
Unamortized Debt Issuance Expense | 27,699 | 33,017
Less amounts due in one year | (1,677) | (1,819)
Long-term Debt, Excluding Current Maturities | 2,722,995 | 2,703,899
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months | 1,804 |
Long-term Debt, Maturities, Repayments of Principal in Year Two | 672 |
Long-term Debt, Maturities, Repayments of Principal in Year Three | 292 |
Long-term Debt, Maturities, Repayments of Principal in Year Four | 275,740 |
Long-term Debt, Maturities, Repayments of Principal in Year Five | 20,861 |
Long-term Debt, Maturities, Repayments of Principal after Year Five | 2,454,043 |
Long-term Debt | 2,753,412 |
Senior notes due April 2020 at 8.25% |  |
Debt Instrument [Line Items] |  |
Long-term Debt | 74,470 | 74,470
Senior notes due March 2021 at 6.375% |  |
Debt Instrument [Line Items] |  |
Long-term Debt | 20,611 | 20,611
Revolving Credit Facility [Member] |  |
Debt Instrument [Line Items] |  |
Long-term Debt | 201,000 | 185,000
Senior Secured Notes Due April 2022 Par Value [Member] |  |
Debt Instrument [Line Items] |  |
Long-term Debt |  | 1,855,617
Senior Notes due April 2023 [Member] |  |
Debt Instrument [Line Items] |  |
Long-term Debt | 494,344 | 493,439
Baltimore Port Facility revenue bonds in series due September 2025 at 5.75% |  |
Debt Instrument [Line Items] |  |
Long-term Debt | 102,865 | 102,865
Advance royalty commitments |  |
Debt Instrument [Line Items] |  |
Long-term Debt | 2,678 | 3,964
Note due through December 2012 at 6.10% |  |
Debt Instrument [Line Items] |  |
Long-term Debt | $ 1,672 | $ 2,769

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- Definition Amount of long-term debt before deduction of unamortized discount or premium. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, with initial maturities beyond one year or the normal operating cycle, if longer. + 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 + Details
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- Definition Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. 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 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: 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 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20, 22 -Article 5 + Details
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