Significant Accounting Policies Fair Value Measurements (Details) - Fair value, measurements, recurring - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Total assets at fair value	$ 45,324	$ 41,797
Commodity contracts, net	(1,860)
Foreign exchange contracts, net	(2,180)	(2,570)
Total liabilities at fair value	(49,364)	(48,976)
Commodity contracts
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Commodity contracts, net		(4,609)
Level 1
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Total assets at fair value	45,324	41,797
Total liabilities at fair value	(45,324)	(41,797)
Level 2
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Total assets at fair value	0	0
Commodity contracts, net	(1,860)
Foreign exchange contracts, net	(2,180)	(2,570)
Total liabilities at fair value	(4,040)	(7,179)
Level 2 | Commodity contracts
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Commodity contracts, net		(4,609)
Supplemental Employee Retirement Plans, Defined Benefit
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Non-qualified deferred compensation assets	45,324	41,797
Non-qualified deferred compensation liabilities	(45,324)	(41,797)
Supplemental Employee Retirement Plans, Defined Benefit | Level 1
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Non-qualified deferred compensation assets	45,324	41,797
Non-qualified deferred compensation liabilities	$ (45,324)	$ (41,797)