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Income Taxes (Narrative) (Details) - USD ($) $ in Thousands | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Income Tax Contingency [Line Items] |  |  |  |
Impact of Tax Reform | $ 172,100 |  |  |
Deferred Tax Assets, Operating Loss Carryforwards, Domestic | 41,282 | $ 187,817 |  |
Gross unrecognized tax benefits | 48,604 | 21,502 | $ 38,992 | $ 32,911
Unrecognized Tax Benefits that Would Impact Effective Tax Rate | 23,400 | 14,000 |  |
Unrecognized tax benefits, income tax penalties and interest accrued | 4,900 | 12,200 |  |
Possible decrease in unrecognized tax benefits | $ 40,000 |  |  |
Minimum [Member] |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Operating loss carryforwards, expiration dates | Jan. 01, 2031 |  |  |
IncomeTaxNetOperatingLossCarryforwardPeriod | 5 years |  |  |
Income tax examination, year(s) under examination | 2005 |  |  |
Maximum [Member] |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Operating loss carryforwards, expiration dates | Jan. 01, 2032 |  |  |
IncomeTaxNetOperatingLossCarryforwardPeriod | 20 years |  |  |
Income tax examination, year(s) under examination | 2017 |  |  |
2016 to 2020 [Member] | Minimum [Member] |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Operating loss carryforwards, expiration dates | Jan. 01, 2018 |  |  |
2016 to 2020 [Member] | Maximum [Member] |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Operating loss carryforwards, expiration dates | Jan. 01, 2022 |  |  |
2016 to 2020 [Member] | State and Local Jurisdiction [Member] |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration | $ 26,900 |  |  |
2021 to 2025 [Member] | Minimum [Member] |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Operating loss carryforwards, expiration dates | Jan. 01, 2023 |  |  |
2021 to 2025 [Member] | State and Local Jurisdiction [Member] |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration | $ 221,300 |  |  |
Net Operating Loss (NOL) Expiration Period energy credit [Member] | Minimum [Member] |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Operating loss carryforwards, expiration dates | Jan. 01, 2027 |  |  |
Net Operating Loss (NOL) Expiration Period energy credit [Member] | Maximum [Member] |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Operating loss carryforwards, expiration dates | Jan. 01, 2036 |  |  |
New Accounting Pronouncement, Early Adoption, Effect [Member] | Retained Earnings [Member] | Accounting Standards Update 2016-09, Excess Tax Benefit Component [Member] |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Cumulative Effect of New Accounting Principle in Period of Adoption |  | $ 18,600 |  |

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