Employee Benefit Plans (Qualified Pension Plan Assets Narrative) (Details) (Pension Plans, Defined Benefit, USD $)				12 Months Ended				12 Months Ended				12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2012 Equity Securities		Dec. 31, 2011 Equity Securities		Dec. 31, 2012 Fixed Income Funds		Dec. 31, 2011 Fixed Income Funds		Dec. 31, 2012 Cash and Cash Equivalents		Dec. 31, 2011 Cash and Cash Equivalents
Defined Benefit Plans and Other Postretirement Benefit Plans
Fair value of qualified plan assets	$ 46,547,000	$ 43,852,000	$ 49,537,000	$ 26,067,000	[1]	$ 25,844,000	[2]	$ 20,022,000	[3]	$ 17,439,000	[4]	$ 458,000	[5]	$ 569,000	[5]
Expected Future Benefit Payments, Next Twelve Months	5,000,000
Expected Future Benefit Payments, Year Two	4,400,000
Expected Future Benefit Payments, Year Three	4,100,000
Expected Future Benefit Payments, Year Four	3,800,000
Expected Future Benefit Payments, Year Five	3,900,000
Expected Future Benefit Payments, Five Fiscal Years Thereafter	$ 16,700,000
Target Plan Asset Allocations Range Minimum (as a percentage)				50.00%				20.00%				0.00%
Target Plan Asset Allocations Range Maximum (as a percentage)				70.00%				50.00%				15.00%

[1] This category includes investments in equity securities of large, small and medium sized companies, equity securities of foreign companies and equity funds, or 53.3%, 11.6%, 12.8%, 17.2% and 5.1% of total equity securities, respectively. Of the total equity amount, 11.6% was invested in common stocks in a wide variety of industries, 86.5% was invested in mutual funds and 1.9% was invested in exchange traded funds. The funds are valued using the closing market prices at December 31, 2012.

[2] This category includes investments in equity securities of large, small and medium sized companies, equity securities of foreign companies and other, or 54.5%, 15.4%, 12.0%, 14.4% and 3.7% of total assets, respectively. Of the total equity amount, 15.5% was invested in common stocks in a wide variety of industries, 82.8% was invested in mutual funds and 1.7% was invested in exchange traded funds. The funds are valued using the closing market prices at December 31, 2011

[3] This category includes investments in investment-grade fixed-income instruments and corporate bonds. The funds are valued using the closing market prices at December 31, 2012

[4] This category includes investments in investment-grade fixed-income instruments and corporate bonds. The funds are valued using the closing market prices at December 31, 2011

[5] This category comprises the cash held to pay beneficiaries. The fair value of cash equals its book value