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Revolving Credit Facility and Long-Term Debt - Principal Balances under Long-term Debt (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Mar. 14, 2018	Dec. 31, 2017
Line of Credit Facility [Line Items]
Total long-term debt	$ 413,567		$ 278,472
Collateralized debt facility	6,985	$ 7,000	6,959
Less unamortized debt issuance costs	(418)		(487)
Less current portion	21,985		19,459
Long-term portion	391,582		259,013
Term Loan
Line of Credit Facility [Line Items]
Total long-term debt	80,000		85,000
Revolving Credit Facility
Line of Credit Facility [Line Items]
Total long-term debt	$ 327,000		$ 187,000

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- Definition

Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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

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Amount after unamortized (discount) premium and debt issuance costs of long-term debt classified as noncurrent and excluding amounts to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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