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Financial Instrument Risk Financial Instruments Risk (Details) - USD ($) $ in Thousands	1 Months Ended	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Mar. 31, 2016	Feb. 16, 2016
Interest Rate Derivatives [Abstract]
Long-term Debt	$ 437,629	$ 437,629	$ 344,589
Repayment of Term Loan		754,071	0	$ 57,600
Medium-term Notes [Member] | Term Loans Due 2022 and 2026 [Member]
Interest Rate Derivatives [Abstract]
Long-term Debt	125,000	125,000
Medium-term Notes [Member] | Term Loans Due 2022 and 2026 [Member] | London Interbank Offered Rate (LIBOR) [Member]
Interest Rate Derivatives [Abstract]
Long-term Debt	95,000	95,000
Medium-term Notes [Member] | Term Loan Due 2026 [Member]
Interest Rate Derivatives [Abstract]
Long-term Debt	45,000	45,000	$ 0
Repayment of Term Loan	30,000
Interest Rate Swap - $50 million notional amount fixed at 1.007% [Member] | Not Designated as Hedging Instrument [Member]
Interest Rate Derivatives [Abstract]
Interest rate swaps, notional amount						$ 50,000
Interest rate swaps, fixed interest rate						1.007%
Interest Rate Swap - $75 million notional amount fixed at 1.256% [Member] | Not Designated as Hedging Instrument [Member]
Interest Rate Derivatives [Abstract]
Interest rate swaps, notional amount					$ 75,000
Interest rate swaps, fixed interest rate					1.256%
Interest Rate Swap [Member] | Not Designated as Hedging Instrument [Member] | Level 2 [Member] | Other Assets [Member]
Interest Rate Derivatives [Abstract]
Fair value of interest rate swap agreements, Asset	$ 4,200	$ 4,200

X

- Definition

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column B

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- Definition

Fixed interest rate related to the interest rate derivative.

+ References

No definition available.

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4B
-Subparagraph (c)(2)
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- Definition

Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(16))
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The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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