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Leases (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Jan. 01, 2019
Lessee, Lease, Description [Line Items]
Short-term lease cost	$ 4,909
Financing lease cost	297
Operating lease cost	58
Total lease cost	5,264
Short-term lease, cost, capitalized	$ 3,100
Accounting Standards Update 2016-02
Lessee, Lease, Description [Line Items]
Right-of-use asset		$ 2,300
Finance lease, liability		$ 2,400

X

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Short-term lease, cost, capitalized

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

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

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Amount of amortization expense attributable to right-of-use asset from finance lease.

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Amount of single lease cost, calculated by allocation of remaining cost of lease over remaining lease term. Includes, but is not limited to, single lease cost, after impairment of right-of-use asset, calculated by amortization of remaining right-of-use asset and accretion of lease liability.

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