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Pension Plans and Other Postretirement Benefits (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013
Defined Benefit Plan [Member]
Summary of minimum funding requirement, contributions made 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-Q (1)	3,000
2012 Form 10-K (2)	2,500
Supplemental Defined Benefit Plans [Member]
Summary of minimum funding requirement, contributions made and the expected full year contributions for the Company's plans
Minimum funding requirement for 2013
Contributions made in the three months ended March 31, 2013	328
Expected contributions (approximations) for the year ended December 31, 2013 as of the time of:
This Form 10-Q (1)	1,320
2012 Form 10-K (2)	1,320
Other Postretirement Benefits [Member]
Summary of minimum funding requirement, contributions made and the expected full year contributions for the Company's plans
Minimum funding requirement for 2013
Contributions made in the three months ended March 31, 2013	33
Expected contributions (approximations) for the year ended December 31, 2013 as of the time of:
This Form 10-Q (1)	480
2012 Form 10-K (2)	$ 480