Debt Obligations - Debt & Capital Leases (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Capital lease obligations	$ 6,825	$ 6,805
Total debt and capital lease obligations	252,757	250,209
Less current portion	6,825	0
Long-term debt and capital lease obligations	$ 245,932	250,209
Option To Repurchase Headquarters Building 2019
Debt Instrument [Line Items]
Imputed interest rate, as a percentage	13.00%
Principal amount	$ 250,000	250,000
Less unamortized discount based on imputed interest rate of 13.0%	4,068	6,596
Net option to repurchase ownership interest in headquarters building in 2019	$ 245,932	$ 243,404

Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal through the balance sheet date.

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

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The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset.

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