Leases Non lease Arrangements Future Commitments (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Non lease Arrangements Future Commitments [Abstract]
Lease Liability	$ 17,068
Other Commitments, Future Minimum Payments, Remainder of Fiscal Year	6,886
Other Commitment, Due in Second Year	27,543	$ 32,093
Other Commitment, Due in Third Year	26,050	26,675
Other Commitment, Due in Fourth Year	23,739	23,355
Other Commitment, Due in Fifth Year	23,195	21,890
Other Commitment, Due after Fifth Year	398	3,299
Other Commitment	$ 107,811	$ 141,501