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Leases - Schedule of operating lease liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
2019 (excluding the three months ended March 31, 2019)	$ 19,417
2020	24,418
2021	20,331
2022	15,731
2023	11,694
Thereafter	14,636
Total minimum lease payments	106,227
Less: Amount of payments representing interest	(10,339)
Present value of future minimum lease payments	95,888
Less: Current obligations	(24,726)	$ 0
Long-term portion of operating leases	$ 71,162	$ 0

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

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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.

+ References

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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.

+ References

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Amount of lessee's undiscounted obligation for lease payments for operating lease, due in fourth 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 for operating lease having an initial or remaining lease term in excess of one year due in remainder of fiscal year following latest fiscal year.

+ References

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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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