Debt Schedule of Debt (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Debt Instrument [Line Items]
Total debt	$ 323,969us-gaap_LongTermDebt
Current portion of debt	30,000us-gaap_LongTermDebtCurrent	26,250us-gaap_LongTermDebtCurrent
Long-term debt	293,969us-gaap_LongTermDebtNoncurrent	352,500us-gaap_LongTermDebtNoncurrent
Secured Debt [Member]
Debt Instrument [Line Items]
Total debt	323,969	378,750
Current portion of debt	30,000	26,250
Long-term debt	293,969	352,500
2011 Senior Secured Credit Facility [Member]
Debt Instrument [Line Items]
Long-term Line of Credit	91,469	120,000
2011 Senior Secured Credit Facility [Member] \| USD Denominated Term Loan [Member]
Debt Instrument [Line Items]
Loans Payable to Bank	$ 232,500	$ 258,750

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.

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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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