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Note 3 - Long-term Debt (Details Textual) - USD ($) |  |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Feb. 16, 2016 | Jun. 13, 2014 | Dec. 31, 2014 | Sep. 15, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
2020 Notes [Member] |  |  |  |  |  |  |
Unsecured Debt |  |  | $ 675,000,000 |  | $ 675,000,000 | $ 675,000,000 |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 7.50% |  | 7.50% | 7.50% |
Debt Instrument, Interest Rate, Effective Percentage |  |  | 7.30% |  | 7.30% | 7.30% |
Long-term Debt, Gross |  |  |  |  | $ 675,000,000 |  |
Debt Issuance Cost |  |  |  |  |  |  | $ 7,300,000
Deferred Finance Costs, Net |  |  | $ 11,300,000 |  | 9,300,000 | $ 11,300,000 |
Debt Instrument, Face Amount |  |  |  |  |  |  | 375,000,000
2014 Senior Credit Facility [Member] | Base Rate [Member] | Subsequent Event [Member] |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate | 2.1875% |  |  |  |  |  |
2014 Senior Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member] | Subsequent Event [Member] |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate | 3.1875% |  |  |  |  |  |
Debt Instrument, Basis Spread on Minimum Variable Rate | 0.75% |  |  |  |  |  |
2014 Senior Credit Facility [Member] | Subsequent Event [Member] |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | $ 60,000,000 |  |  |  |  |  |
Line of Credit Facility, Increase | $ 10,000,000 |  |  |  |  |  |
2014 Senior Credit Facility [Member] |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  | $ 625,000,000 |  |  |  |  |
Long-term Debt, Gross |  |  | 556,438,000 |  | 556,438,000 | 556,438,000 |
Debt Issuance Cost |  |  |  |  |  | 9,210,000 |
Deferred Finance Costs, Net |  |  | 7,400,000 |  | $ 6,100,000 | 7,400,000 |
Gains (Losses) on Extinguishment of Debt |  |  |  |  |  | (4,900,000) |
2014 Term Loan [Member] | Base Rate [Member] | Minimum [Member] |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  |  | 1.75% |  |
2014 Term Loan [Member] | Base Rate [Member] | Maximum [Member] |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  |  | 2.00% |  |
2014 Term Loan [Member] | Base Rate [Member] | Amendment and Incremental Facility [Member] |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  |  | 2.1875% |  |
2014 Term Loan [Member] | London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member] |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  |  | 2.75% |  |
2014 Term Loan [Member] | London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member] |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  |  | 3.00% |  |
2014 Term Loan [Member] | London Interbank Offered Rate (LIBOR) [Member] | Amendment and Incremental Facility [Member] |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  |  | 3.1875% |  |
Debt Instrument, Basis Spread on Minimum Variable Rate |  |  |  |  | 0.75% |  |
2014 Term Loan [Member] | Minimum LIBOR Floor [Member] |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  |  | 0.75% |  |
2014 Term Loan [Member] |  |  |  |  |  |  |
Long-term Debt |  | 575,000,000 |  |  |  |  |
Proceeds from Issuance of Long-term Debt |  | 525,000,000 |  | $ 100,000,000 |  |  |
Debt Instrument Periodic Principal Payment, Principal |  |  |  |  | 0.25% |  |
Repayments of Long-term Debt |  |  | 67,000,000 |  |  |  |
2014 Revolving Credit Facility [Member] | Base Rate [Member] | Minimum [Member] |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  |  | 1.00% |  |
2014 Revolving Credit Facility [Member] | Base Rate [Member] | Maximum [Member] |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  |  | 1.50% |  |
2014 Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member] |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  |  | 2.00% |  |
2014 Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member] |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  |  | 2.50% |  |
2014 Revolving Credit Facility [Member] | Plus Overnight Federal Funds Rate [Member] |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  |  | 0.50% |  |
2014 Revolving Credit Facility [Member] | Plus One-Month LIBOR [Member] |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  |  | 1.00% |  |
2014 Revolving Credit Facility [Member] | Minimum [Member] |  |  |  |  |  |  |
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage |  |  |  |  | 0.375% |  |
2014 Revolving Credit Facility [Member] | Maximum [Member] |  |  |  |  |  |  |
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage |  |  |  |  | 0.50% |  |
2014 Revolving Credit Facility [Member] |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  | $ 50,000,000 |  |  |  |  |
Long-term Debt, Gross |  |  |  |  | $ 556,400,000 |  |
Line of Credit Facility, Interest Rate at Period End |  |  |  |  | 3.80% |  |
Line of Credit Facility, Remaining Borrowing Capacity |  |  | 50,000,000 |  | $ 50,000,000 | 50,000,000 |
2016 Term Loan [Member] | Base Rate [Member] | Subsequent Event [Member] |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate | 2.50% |  |  |  |  |  |
2016 Term Loan [Member] | London Interbank Offered Rate (LIBOR) [Member] | Subsequent Event [Member] |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate | 3.50% |  |  |  |  |  |
Debt Instrument, Basis Spread on Minimum Variable Rate | 0.75% |  |  |  |  |  |
2016 Term Loan [Member] | Subsequent Event [Member] |  |  |  |  |  |  |
Long-term Debt | $ 425,000,000 |  |  |  |  |  |
Debt Instrument Periodic Principal Payment, Principal | 0.25% |  |  |  |  |  |
Debt Instrument, Face Amount | $ 425,000,000 |  |  |  |  |  |
Interest Costs Capitalized |  |  |  |  | 0 | 0 | 0
Long-term Debt |  |  | $ 1,200,000,000 |  | 1,200,000,000 | 1,200,000,000 |
Proceeds from Issuance of Long-term Debt |  |  |  |  | 0 | 644,000,000 | 390,926,000
Repayments of Long-term Debt |  |  |  |  | 0 | 249,623,000 | 381,003,000
Long-term Debt, Gross |  |  |  |  | 1,231,438,000 |  |
Gains (Losses) on Extinguishment of Debt |  |  |  |  | 0 | (5,086,000) | 0
Interest Paid |  |  |  |  | $ 76,900,000 | $ 61,900,000 | $ 49,400,000

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