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Long-Term Debt Partial Redemption of 5% Notes (Details) - USD ($) |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Apr. 03, 2017 | Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Debt Instrument [Line Items] |  |  |  |  |
Loss on early extinguishment of debt |  | $ 4,375,000 | $ 0 | $ 7,052,000 | $ 0
Senior Notes [Member] | Five Percent Senior Notes due 2020 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Early Repayment of Senior Debt | $ 220,000,000.0 |  |  |  |
Debt Instrument, Redemption Price, Percentage | 101.25% |  |  |  |
Loss on early extinguishment of debt |  | $ 4,400,000 |  |  |

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