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Fair Value Measurements (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 | Dec. 31, 2017
Assets: |  |
Held-to-maturity Securities, Transferred Security, at Carrying Value | $ 0 |
Held-to-maturity Securities, Unrecognized Holding Gain | 0 |
Other than Temporary Impairment Losses, Investments, Held-to-maturity Securities | 0 |
Liabilities: |  |
Embedded derivative | (699) | $ (538)
Long-term Debt, Fair Value | 1,015,400 | 1,071,200
Carrying value of long-term debt, excluding derivative liabilities | 414,342 | 379,033
Derivative, Notional Amount | 100,000 | 100,000
Fair Value, Measurements, Recurring [Member] |  |
Assets: |  |
Assets held in rabbi trusts | 43,756 | 45,252
Available for sale securities | 4,702 | 4,621
Fair Value Assets | 48,458 | 49,873
Liabilities: |  |
Fair Value Liabilities | (699) | (538)
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member] |  |
Assets: |  |
Assets held in rabbi trusts | 27,199 | 28,589
Available for sale securities | 4,702 | 4,621
Fair Value Assets | 31,901 | 33,210
Liabilities: |  |
Fair Value Liabilities | 0 | 0
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] |  |
Assets: |  |
Assets held in rabbi trusts | 16,557 | 16,663
Available for sale securities | 0 | 0
Fair Value Assets | 16,557 | 16,663
Liabilities: |  |
Fair Value Liabilities | 0 | 0
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] |  |
Assets: |  |
Assets held in rabbi trusts | 0 | 0
Available for sale securities | 0 | 0
Fair Value Assets | 0 | 0
Liabilities: |  |
Fair Value Liabilities | (699) | (538)
Convertible Senior Debentures, Due 2040 [Member] |  |
Liabilities: |  |
Embedded derivative | (300) | (206)
Convertible Senior Debentures, Due 2040 [Member] | Fair Value, Measurements, Recurring [Member] |  |
Liabilities: |  |
Embedded derivative | (300) | (206)
Convertible Senior Debentures, Due 2040 [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member] |  |
Liabilities: |  |
Embedded derivative | 0 | 0
Convertible Senior Debentures, Due 2040 [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] |  |
Liabilities: |  |
Embedded derivative | 0 | 0
Convertible Senior Debentures, Due 2040 [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] |  |
Liabilities: |  |
Embedded derivative | (300) | (206)
Convertible Senior Debentures, Due 2041 [Member] |  |
Liabilities: |  |
Embedded derivative | (270) | (214)
Convertible Senior Debentures, Due 2041 [Member] | Fair Value, Measurements, Recurring [Member] |  |
Liabilities: |  |
Embedded derivative | (270) | (214)
Convertible Senior Debentures, Due 2041 [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member] |  |
Liabilities: |  |
Embedded derivative | 0 | 0
Convertible Senior Debentures, Due 2041 [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] |  |
Liabilities: |  |
Embedded derivative | 0 | 0
Convertible Senior Debentures, Due 2041 [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] |  |
Liabilities: |  |
Embedded derivative | (270) | (214)
Convertible Senior Debentures, Due 2042 [Member] |  |
Liabilities: |  |
Embedded derivative | (129) | (118)
Convertible Senior Debentures, Due 2042 [Member] | Fair Value, Measurements, Recurring [Member] |  |
Liabilities: |  |
Embedded derivative | (129) | (118)
Convertible Senior Debentures, Due 2042 [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member] |  |
Liabilities: |  |
Embedded derivative | 0 | 0
Convertible Senior Debentures, Due 2042 [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] |  |
Liabilities: |  |
Embedded derivative | 0 | 0
Convertible Senior Debentures, Due 2042 [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] |  |
Liabilities: |  |
Embedded derivative | $ (129) | $ (118)

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