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Leases - Finance and Operating Lease Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2019 | Dec. 31, 2018
Finance lease cost |  |  |
Amortization of right-of-use assets | $ 361 | $ 683 |
Interest expense | 56 | 109 |
Operating lease cost | 3,398 | 6,833 |
Short-term lease cost | 105 | 211 |
Total lease cost | 3,920 | 7,836 |
Assets |  |  |
Operating lease right-of-use assets | 65,300 | 65,300 | $ 0
Finance lease right-of-use assets | 13,534 | 13,534 |
Lease, right-of-use asset | 78,834 | 78,834 |
Current liabilities |  |  |
Operating lease liabilities | 7,272 | 7,272 | 0
Finance lease liabilities | 2,331 | 2,331 |
Non-current liabilities |  |  |
Operating lease liabilities | 64,152 | 64,152 | $ 0
Finance lease liabilities | 6,376 | 6,376 |
Total lease liabilities | $ 80,131 | $ 80,131 |

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- Definition Amount of interest expense on finance lease liability. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918686-209980 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918638-209977 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 55 -Paragraph 53 -URI http://asc.fasb.org/extlink&oid=77888399&loc=SL77918982-209971 + Details
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- Definition Present value of lessee's discounted obligation for lease payments from finance lease, classified as current. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977 + Details
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