General - Lease Assets and Liabilities and Maturity Dates of Leases (Details) $ in Thousands	Jun. 30, 2019 USD ($)
Components of lease assets and liabilities:
Operating lease right-of-use assets	$ 52,862
Current operating lease liabilities	$ 13,334
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]	Accrued Liabilities, Current
Long-term operating lease liabilities	$ 47,773
Total operating lease liabilities	61,107
Finance lease assets	$ 14,670
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	Property, Plant and Equipment, Net
Current finance lease liabilities	$ 4,250
Finance Lease, Liability, Current, Statement of Financial Position [Extensible List]	Long-term Debt and Capital Lease Obligations, Current
Long-term finance lease liabilities	$ 15,846
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	Long-term Debt and Capital Lease Obligations
Total finance lease liabilities	$ 20,096
Maturity dates of leases:
2019	9,446
2020	17,034
2021	16,423
2022	15,403
2023	11,426
2024 and beyond	13,758
Total lease payments	83,490
Less interest	(2,287)
Present value of lease liabilities	$ 81,203
Weighted average remaining lease term
Operating leases	4 years 8 months 12 days
Finance leases	5 years 1 month 20 days
Weighted average discount rate
Operating leases	4.79%
Finance leases	4.52%