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Pension Plans and Other Postretirement Benefits (Details 7) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012
Defined Benefit Plan [Member]
Summary of minimum funding requirement and the expected full year contributions for the Company's plans
Minimum funding requirement for 2013
Expected contributions (approximations) for the year ended December 31, 2013 as of the time of this Form 10-K (1)	2,500
Supplemental Retirement Plans [Member]
Summary of minimum funding requirement and the expected full year contributions for the Company's plans
Expected contributions (approximations) for the year ended December 31, 2013 as of the time of this Form 10-K (1)	1,320
Other Postretirement Benefit [Member]
Summary of minimum funding requirement and the expected full year contributions for the Company's plans
Expected contributions (approximations) for the year ended December 31, 2013 as of the time of this Form 10-K (1)	$ 480