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Lease Obligations - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Jan. 01, 2019	Dec. 31, 2018
Additional right of use lease assets	$ 16,266		$ 0
Leased assets capitalized			2,700
Capital lease obligations classified as current			1,100
Capital lease obligations			$ 2,600
Option to terminate leases, period	1 year
Option to extend lease term (up to)	5 years
Minimum lease payments required	$ 20,140
Accounting Standards Update 2016-02 [Member]
Additional right of use lease assets		$ 16,300
Additional lease liabilities		$ 16,000
Subsidiaries [Member] | Employees [Member]
Minimum lease payments required	$ 2,800
Lease amortization period	4 years 3 months 18 days
Minimum [Member]
Remaining lease term	1 year
Maximum [Member]
Remaining lease term	8 years

X

- Definition

Represents the amount of finance and operating lease liability non-current.

+ References

No definition available.

+ Details

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X

- Definition

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

+ References

No definition available.

+ Details

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X

- Definition

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

+ References

No definition available.

+ Details

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- Definition

Lessee operating and finance leases remaining contract term.

+ References

No definition available.

+ Details

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X

- Definition

It represents Lessee Operating Lease Amortization Period.

+ References

No definition available.

+ Details

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X

- 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
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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-SubTopic 30
-Section 50
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-Subparagraph (SX 210.7-03(a)(16))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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X

- Definition

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

+ 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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X

- 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

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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-Topic 840
-SubTopic 30
-Section 50
-Paragraph 1
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X

- 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
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918701-209980

+ Details

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X

- Definition

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

+ References

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-Publisher FASB
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-SubTopic 20
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