Leases Non lease Arrangements Future Commitments (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Non lease Arrangements Future Commitments [Abstract]
Lease Liability	$ 18,213
Other Commitments, Future Minimum Payments, Remainder of Fiscal Year	14,091
Other Commitment, Due in Second Year	28,181	$ 32,093
Other Commitment, Due in Third Year	26,654	26,675
Other Commitment, Due in Fourth Year	24,289	23,355
Other Commitment, Due in Fifth Year	23,733	21,890
Other Commitment, Due after Fifth Year	407	3,299
Other Commitment	$ 117,355	$ 141,501