Leases (Operating and Finance Lease Assets and Liabilities) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2019 USD ($)
Leases [Abstract]
Asset, operating	$ 70,815
Asset, finance	8,763
Total leased assets	79,578
Present value of lease liabilities	72,315
Present value of lease liabilities	7,828
Total lease liabilities	80,143
Operating lease, fair value adjustment	1,100
Accumulated deprecation on finance leases	$ 447