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Lease Obligations - Additional information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Jan. 01, 2019	Dec. 31, 2018
Operating And Finance Leases [Line Items]
Additional right of use lease assets	$ 22,958		$ 0
Additional operating lease liabilities	16,884		0
Minimum lease payments required	29,514
Capital lease obligations outstanding			2,700
Current portion of capital lease obligations			1,100
Leased assets capitalized			$ 2,600
Subsidiaries [Member] | Employees [Member]
Operating And Finance Leases [Line Items]
Minimum lease payments required	$ 4,500
Lease amortization period	4 years 6 months
Accounting Standards Update 2016-02 [Member]
Operating And Finance Leases [Line Items]
Additional right of use lease assets		$ 15,100
Additional operating lease liabilities		$ 15,100

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- Definition

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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Amount of capital lease obligation due within one year or the normal operating cycle, if longer.

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The total gross amount less the charge for the use of the long-lived depreciable assets subject to a lease meeting the criteria for capitalization.

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Amount of lessee's undiscounted obligation for lease payments for operating lease.

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Present value of lessee's discounted obligation for lease payments from operating lease, classified as noncurrent.

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Amount of lessee's right to use underlying asset under operating lease.

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