Income Taxes (Summary Of Net Operating Loss Carryforwards) (Details) $ in Thousands	Dec. 31, 2015 USD ($)
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	$ 163,722
2016 - 2020
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	31,205
2021 - 2025
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	7,436
2026 - 2030
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	4,140
2031 - 2035
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	19,200
Unlimited
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	$ 101,741