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Lease Obligations - Narrative (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jan. 01, 2019	Dec. 31, 2018
Additional right of use lease assets	$ 14,130		$ 0
Option to extend lease term (up to)	5 years
Option to terminate leases, period	1 year
Minimum lease payments required	$ 17,910
Capital lease obligations			2,600
Capital lease obligations classified as current			1,100
Leased assets capitalized			$ 2,700
Accounting Standards Update 2016-02 [Member]
Additional right of use lease assets		$ 15,100
Subsidiaries [Member] | Employees [Member]
Minimum lease payments required	$ 2,500
Lease amortization period	4 years
Minimum [Member]
Remaining lease term	1 year
Maximum [Member]
Remaining lease term	8 years

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- Definition

Lessee, operating and finance leases, option to extend, term.

+ References

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- Definition

Lessee, operating and finance leases, option to terminate, period.

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- Definition

Lessee operating and finance leases remaining contract term.

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- Definition

It represents Lessee Operating Lease Amortization Period.

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No definition available.

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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.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
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- Definition

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

+ References

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- Definition

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.

+ References

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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- Definition

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

+ References

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