Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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

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Weighted average interest rate of debt outstanding.

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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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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, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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The potential limit on availability under the revolving credit facility per the total leverage financial covenant.

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The total leverage financial covenant on the Revolving Loans which may limit the entity's the ability to incur additional indebtedness and liens, make or declare dividends, or enter into certain transactions.

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Long-term Debt - agreement information (Details) - USD ($) $ in Thousands	Jul. 31, 2014	Jun. 30, 2018	Dec. 31, 2017
Long-term Debt
Amount outstanding			$ 241,437
Maturities of long term debt
Term Loan			$ 248,529
Interest rate at end of period		2.75%
Weighted average interest rate			7.30%
Term Loan
Long-term Debt
Face amount	$ 275,000
Amount outstanding			$ 248,500
Revolving Loans
Long-term Debt
Maximum borrowing capacity	50,000	$ 50,000
Amount outstanding		0	0
Accrued interest		0	200
Maturities of long term debt
Total leverage financial covenant draw limit	15,000
Potential cap on availability	15,000
Letters of credit
Long-term Debt
Maximum borrowing capacity	$ 10,000
Amount outstanding		$ 0	$ 0