Leases (Maturity of Lease Liabilities) (Details)	Mar. 31, 2019 USD ($)
Operating Leases
2019 (remainder)	$ 29,174,000
2020	31,363,000
2021	22,422,000
2022	15,379,000
2023	11,009,000
Thereafter	13,952,000
Total lease payments	123,299,000
Less: interest	8,749,000
Present value of lease payments	114,550,000
Finance Leases
2019 (remainder)	1,591,000
2020	2,124,000
2021	2,113,000
2022	2,076,000
2023	2,076,000
Thereafter	11,959,000
Total lease payments	21,939,000
Less: interest	4,720,000
Present value of lease payments	17,219,000
Total
2019 (remainder)	30,765,000
2020	33,487,000
2021	24,535,000
2022	17,455,000
2023	13,085,000
Thereafter	25,911,000
Total lease payments	145,238,000
Option to extend operating leases	$ 4,211,000