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Leases (Narrative) (Details) - USD ($) $ in Thousands | 6 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Mar. 31, 2019 | Jan. 01, 2019
Operating Leased Assets [Line Items] |  |  |  |
Option to extend the lease, term | up to 5 years |  |  |
Option to terminate the lease, term | within 1 year |  |  |
Lease right of use assets | $ 90,755 |  |  |
Lease liabilities | $ 101,593 |  |  |
Weighted average rate | 3.46% |  |  | 3.47%
Operating lease payments related to extended lease terms |  | $ 2,300 |  |
Lease payments for leases signed, but not yet commenced |  | $ 1,300 |  |
ASU 2016-02 [Member] |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |
Lease right of use assets |  |  | $ 87,800 |
Lease liabilities |  |  | $ 98,700 |
Minimum [Member] |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |
Remaining terms of leases under operating lease | 1 year |  |  |
Maximum [Member] |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |
Remaining terms of leases under operating lease | 10 years |  |  |

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- Definition Description of terms and conditions of option to extend lessee's operating lease. Includes, but is not limited to, information about option recognized as part of right-of-use asset and 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 3 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918673-209980 + Details
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