Significant Accounting Policies Fair Value Measurements (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract] (Deprecated 2018-01-31)
Foreign exchange contracts, net		$ 54,244
Debt and Capital Lease Obligations	$ 1,112,622	913,012
Estimate of Fair Value Measurement [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract] (Deprecated 2018-01-31)
Long-term Debt, Fair Value	1,117,197	922,123
Reported Value Measurement [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract] (Deprecated 2018-01-31)
Debt and Capital Lease Obligations	1,112,622	913,012
Fair value, measurements, recurring
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract] (Deprecated 2018-01-31)
Foreign exchange contracts, net		54,244
Total assets at fair value	60,759
Non-qualified deferred compensation liabilities		(54,244)
Financial and Nonfinancial Liabilities, Fair Value Disclosure	(54,828)	(54,670)
Fair value, measurements, recurring \| Supplemental Employee Retirement Plans, Defined Benefit
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract] (Deprecated 2018-01-31)
Non-qualified deferred compensation assets	54,828	54,244
Non-qualified deferred compensation liabilities	(54,828)
Fair value, measurements, recurring \| Level 1
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract] (Deprecated 2018-01-31)
Total assets at fair value	54,828
Financial and Nonfinancial Liabilities, Fair Value Disclosure	(54,828)	(54,244)
Fair value, measurements, recurring \| Level 1 \| Supplemental Employee Retirement Plans, Defined Benefit
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract] (Deprecated 2018-01-31)
Non-qualified deferred compensation assets	54,828	54,244
Non-qualified deferred compensation liabilities	(54,828)	(54,244)
Fair value, measurements, recurring \| Level 2
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract] (Deprecated 2018-01-31)
Total assets at fair value	5,931
Financial and Nonfinancial Liabilities, Fair Value Disclosure	0	(426)
Foreign Exchange Contract \| Fair value, measurements, recurring
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract] (Deprecated 2018-01-31)
Foreign exchange contracts, net	5,931
Foreign Exchange Contract \| Fair value, measurements, recurring \| Level 2
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract] (Deprecated 2018-01-31)
Foreign exchange contracts, net	$ 5,931
Commodity contracts \| Fair value, measurements, recurring
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract] (Deprecated 2018-01-31)
Financial and Nonfinancial Liabilities, Fair Value Disclosure		(426)
Commodity contracts \| Fair value, measurements, recurring \| Level 2
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract] (Deprecated 2018-01-31)
Financial and Nonfinancial Liabilities, Fair Value Disclosure		$ (426)

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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-Name Accounting Standards Codification
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Sum of the carrying values as of the balance sheet date of all debt, including all short-term borrowings, long-term debt, and capital lease obligations.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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Aggregate carrying value as of the balance sheet date of the liabilities for all deferred compensation arrangements. Represents currently earned compensation under compensation arrangements that is not actually paid until a later date.

+ References

No definition available.

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Carrying amount as of the balance sheet date of assets held under deferred compensation agreements.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
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Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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-SubTopic 20
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-Publisher FASB
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Fair value portion of asset contracts related to the exchange of different currencies, including, but not limited to, foreign currency options, forward contracts, and swaps.

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Fair value of financial and nonfinancial obligations.

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The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

+ References

No definition available.

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