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Long-Term Debt (Details) - USD ($) | 9 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2016 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Mar. 31, 2016
Debt Instrument [Line Items] |  |  |  |  |
Proceeds from Issuance of Private Placement | $ 500,000,000 |  |  |  |
Long-term Debt |  | $ 2,724,672,000 | $ 2,705,718,000 |  |
Unamortized Debt Issuance Expense |  | 27,699,000 | 33,017,000 |  |
Less amounts due in one year |  | (1,677,000) | (1,819,000) |  |
Long-term Debt, Excluding Current Maturities |  | 2,722,995,000 | 2,703,899,000 |  |
Debt and Capital Lease Obligations |  | 10,323,000 | 7,590,000 |  |
Gains (Losses) on Extinguishment of Debt |  | 0 | (67,751,000) | $ (95,267,000) |
Senior Secured Notes due April 2022 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term Debt |  | 1,854,731,000 |  |  |
Senior Notes due April 2023 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term Debt |  | 494,344,000 | 493,439,000 |  |
Long-term Debt, Percentage Bearing Fixed Interest, Amount |  | 0.0800 |  |  |
Debt Instrument, Unamortized Discount |  | 7,240,000 |  |  |
Senior Notes 8.25 Percent Due April 2020 Amount Purchased [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term Debt |  | 2,508,000 |  |  | $ 937,822,000
Gains (Losses) on Extinguishment of Debt |  | (67,734,000) |  |  |
Senior notes due April 2020 at 8.25% |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term Debt |  | 74,470,000 | 74,470,000 |  |
Long-term Debt, Percentage Bearing Fixed Interest, Amount |  | 0.0825 |  |  |
Gains (Losses) on Extinguishment of Debt |  | (17,000) |  |  |
Revolving Credit Facility [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  | 400,000,000 |  |  |
Long-term Debt |  | 201,000,000 | 185,000,000 |  |
Senior Secured Notes Due March 2021 Par Value Amount Purchased [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term Debt |  | 213,000 |  |  | $ 229,176,000
Senior notes due March 2021 at 6.375% |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term Debt |  | 20,611,000 | 20,611,000 |  |
Long-term Debt, Percentage Bearing Fixed Interest, Amount |  | 0.06375 |  |  |
Senior Secured Notes Due April 2022 Par Value [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term Debt |  |  | 1,855,617,000 |  |
Baltimore Port Facility revenue bonds in series due September 2025 at 5.75% |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term Debt |  | 102,865,000 | 102,865,000 |  |
Advance royalty commitments |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term Debt |  | 2,678,000 | 3,964,000 |  |
Note due through December 2012 at 6.10% |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term Debt |  | $ 1,672,000 | $ 2,769,000 |  |

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- Definition Sum of the carrying values as of the balance sheet date of all debt, including all short-term borrowings, long-term debt, and 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 210.9-03.13,16) -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 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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- Definition The amount of debt discount that was originally recognized at the issuance of the instrument that has yet to be amortized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28541-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=34725769&loc=d3e28878-108400 + Details
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- Definition Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=49170532&loc=d3e12317-112629 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=49170532&loc=d3e12355-112629 + 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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