Leases Operating leases, Future Minimum Payments Due, Fiscal Maturity (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Operating leases, Future Minimum Payments Due, Fiscal Maturity [Abstract]
Other Commitment, Due in Next Twelve Months		$ 34,189
Other Commitment, Due in Second Year	$ 23,872	32,093
Other Commitment, Due in Third Year	22,372	26,675
Other Commitment, Due in Fourth Year	20,042	23,355
Other Commitment, Due in Fifth Year	19,520	21,890
Other Commitment, Due after Fifth Year	371	3,299
Other Commitment	$ 104,100	141,500
Operating Leases, Future Minimum Payments Due, Future Minimum Sublease Rentals		1,091
Other Commitments, Net		140,410
Capital Leases, Future Minimum Payments Due, Next Twelve Months		266
Capital Leases, Future Minimum Payments Due in Two Years		96
Capital Leases, Future Minimum Payments Due in Three Years		89
Capital Leases, Future Minimum Payments Due in Four Years		67
Capital Leases, Future Minimum Payments Due in Five Years		15
Capital Leases, Future Minimum Payments Due Thereafter		0
Capital Leases, Future Minimum Payments Due		533
Capital Leases Future Minimum Payments, Interest Portion Only		(63)
Capital Leases, Future Minimum Payments, Present Value of Net Minimum Payments		470
Capital Lease Obligations, Current		239
Capital Lease Obligations, Noncurrent		$ 231