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Leases - Supplemental Cash Flow Information (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2019 USD ($)
Cash Paid for Amounts Included in the Measurement of Lease Liabilities:
Operating Cash Flows from Operating Leases	$ 21,153
Financing Cash Flows from Finance Leases	676
Finance Lease, Principal Payments	3,515
Right-of-Use Assets Obtained in Exchange for Lease Obligations:
Operating Leases	15,347
Finance Leases	$ 994

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Right-Of-Use Assets Obtained In Exchange For Lease Obligations [Abstract]

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Amount of interest paid on finance lease liability.

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Amount of cash outflow for principal payment on finance lease.

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Amount of cash outflow from operating lease, excluding payments to bring another asset to condition and location necessary for its intended use.

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