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Summary Of Significant Accounting Policies (Narrative) (Details) - USD ($) | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2017 | Dec. 31, 2016 | Jan. 01, 2017 | Dec. 31, 2015
Cost related to change in estimated fair value of leased instruments | $ 1,300,000 |  |  |
Fair value assets liabilities transfer between levels | $ 0 |  |  |
Future cash flows weighted average market yield | 10.10% | 10.60% |  | 13.50%
Deferred tax assets |  |  | $ 321,500,000 |
Cash, cash equivalents and investments | $ 56,100,000 | $ 72,000,000 |  |
Federal [Member] |  |  |  |
Excluded windfall tax deductions |  | 6,000,000 |  |
State [Member] |  |  |  |
Excluded windfall tax deductions |  | $ 600,000 |  |

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