Income Taxes Income Taxes Details 7 (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Operating Loss Carryforwards [Line Items]
Year One	$ 108,312
Year Two	127,914
Year Three	176,591
Year Four	158,672
Thereafter	3,239,757
Operating Loss Carryforwards	3,811,246
Loss Carry Forwards, Unexpiring	58,400
Loss and tax credit carry-forwards	170,979	$ 157,795
Valuation allowance	141,154	$ 132,500
Federal
Operating Loss Carryforwards [Line Items]
Year One	0
Year Two	0
Year Three	0
Year Four	0
Thereafter	0
Operating Loss Carryforwards	0
Loss and tax credit carry-forwards	0
Valuation allowance	0
State
Operating Loss Carryforwards [Line Items]
Year One	108,312
Year Two	127,914
Year Three	176,591
Year Four	158,672
Thereafter	3,232,606
Operating Loss Carryforwards	3,804,095
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount	3,200
Loss and tax credit carry-forwards	150,031
Valuation allowance	104,637
Foreign
Operating Loss Carryforwards [Line Items]
Year One	0
Year Two	0
Year Three	0
Year Four	0
Thereafter	7,151
Operating Loss Carryforwards	7,151
Loss and tax credit carry-forwards	20,948
Valuation allowance	$ 36,517