Operating and Capital Lease Commitments and Total Rents - Future Miniimum Lease Payments (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Future minimum lease payments for our operating lease
Remaining 2019	$ 13,352		$ 16,344
2020	10,739		9,107
2021	6,027		5,114
2022	3,188		2,863
2023	1,219		1,001
Thereafter	419		408
Total minimum lease payments	34,944		$ 34,837
Less imputed interest	(3,778)
Present value of net minimum lease payments	31,166
Less current portion of operating lease obligation	(14,782)
Operating lease obligation	16,384
Rental expense	$ 6,143	$ 6,660

Refers to present value of minimum lease payments.

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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

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Amount of lessee's undiscounted obligation for lease payments for operating lease, due after fifth fiscal year following latest fiscal year.

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Amount of lessee's undiscounted obligation for lease payments for operating lease, due in next fiscal year following latest fiscal year.

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Amount of lessee's undiscounted obligation for lease payments for operating lease, due in fifth fiscal year following latest fiscal year.

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Amount of lessee's undiscounted obligation for lease payments for operating lease, due in third fiscal year following latest fiscal year.

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

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Present value of lessee's discounted obligation for lease payments from operating lease.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 45
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Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income.

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-Publisher FASB
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-SubTopic 20
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-Paragraph 1
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