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Note 6 - Senior Notes, Credit Facilities, and Capital Leases (Details Textual) $ in Thousands |  | 1 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Apr. 12, 2013 USD ($) | May 31, 2016 USD ($) | Sep. 30, 2016 | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Dec. 31, 2017
Underwriting Discount On Senior Notes |  | 2.00% |  |  |  |  |  |
Leverage Ratio |  |  |  |  | 5 |  |  |
Letters of Credit Outstanding, Amount |  |  |  |  | $ 2,600 |  |  |
Capital Lease Obligations |  |  |  |  | 11,491 | $ 17,600 |  |
Capital Lease Obligations, Current |  |  |  |  | 5,653 | 8,735 |  |
Capital Lease Obligations, Noncurrent |  |  |  |  | 5,838 | 8,841 |  |
Capital Leases, Future Minimum Payments Due |  |  |  |  | 12,047 |  |  |
Capital Leases, Future Minimum Payments, Interest Included in Payments |  |  |  |  | $ 556 |  |  |
Maximum [Member] |  |  |  |  |  |  |  |
Leverage Ratio | [1] |  |  |  | 4 |  |  |
Scenario, Forecast [Member] |  |  |  |  |  |  |  |
Leverage Ratio |  |  |  |  |  |  |  | 4
Revolving Credit Facility [Member] |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  | $ 100,000 |  |  |  |  |
Debt Instrument, Term |  |  | 3 years |  |  |  |  |
Long-term Line of Credit |  |  |  |  | $ 0 |  |  |
Letter of Credit [Member] |  |  |  |  |  |  |  |
Letter of Credit Outstanding, Fronting Fee |  |  |  |  | 0.20% |  |  |
Letter of Credit [Member] | Minimum [Member] |  |  |  |  |  |  |  |
Letter of Credit, Participation Fee, Percent |  |  |  |  | 2.25% |  |  |
Letter of Credit [Member] | Maximum [Member] |  |  |  |  |  |  |  |
Letter of Credit, Participation Fee, Percent |  |  |  |  | 3.25% |  |  |
Senior Notes [Member] |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  | $ 500,000 |  |  |  |  |  |
Pension Contributions |  |  |  |  |  |  | $ 6,500 |
Proceeds from Issuance of Senior Long-term Debt |  | 490,000 |  |  |  |  |  |
Debt Instrument, Unamortized Discount |  | $ 10,000 |  |  | $ 5,500 |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 6.875% |  |  |  |  |  |
Interest Expense, Debt |  |  |  |  | 16,200 | 13,500 |  |
Interest Costs Capitalized |  |  |  |  | $ 20,100 | $ 22,700 |  |
Debt Instrument, Redemption Price, Percentage |  |  |  | 101.00% |  |  |  |
[1] | The leverage ratio was amended to be 5.00:1 for 2016, and reverted back to 4.00:1 effective January 1, 2017.

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- Definition Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal through the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6455398&loc=d3e45280-112737 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(a)(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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- Definition Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal, through the balance sheet date and due to be paid more than one year (or one operating cycle, if longer) after the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6455398&loc=d3e45280-112737 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6455314&loc=d3e45023-112735 Reference 3: 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 Amount of the cost of borrowed funds accounted for as interest expense for 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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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + 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 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 3: 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 + Details
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