Minimum percentage points added to the reference rate to compute the variable rate on the debt instrument.

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Represent the periodic principal payment, as a percent, of the outstanding principal amount borrowed as stated in the terms of the agreement.

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The increased amount of a credit facility under new facility terms.

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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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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.

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Face (par) amount of debt instrument at time of issuance.

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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Amount of debt issuance costs (for example, but not limited to, legal, accounting, broker, and regulatory fees).

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For an unclassified balance sheet, the carrying amount (net of accumulated amortization) as of the balance sheet date of capitalized costs associated with the issuance of debt instruments (for example, legal, accounting, underwriting, printing, and registration costs) that will be charged against earnings over the life of the debt instruments to which such costs pertain.

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Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

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Amount of interest capitalized during the period.

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The amount of cash paid for interest during the period.

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The effective interest rate at the end of the reporting period.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

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The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

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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.

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The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer.

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The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

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Including the current and noncurrent portions, carrying value as of the balance sheet date of uncollateralized debt obligations (with maturities initially due after one year or beyond the operating cycle if longer).

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Note 3 - Long-term Debt (Details Textual) - USD ($)			1 Months Ended		12 Months Ended
Note 3 - Long-term Debt (Details Textual) - USD ($)	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