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Long-term debt schedule (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Apr. 30, 2014	Dec. 31, 2013
Debt Instrument [Line Items]
Long-term Debt	$ 766,796us-gaap_LongTermDebt	$ 820,000us-gaap_LongTermDebt
Long-term debt, current maturities	100,000us-gaap_LongTermDebtCurrent		0us-gaap_LongTermDebtCurrent
Long-term debt, excluding current maturities	666,796us-gaap_LongTermDebtNoncurrent		0us-gaap_LongTermDebtNoncurrent
Senior secured term loan [Member]
Debt Instrument [Line Items]
Long-term Debt	406,796
Senior unsecured notes [Member]
Debt Instrument [Line Items]
Long-term Debt	$ 360,000

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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