Employee Benefit Plans (Details 2) (Frozen pension plan, USD $) In Thousands, unless otherwise specified			12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012 Minimum	Dec. 31, 2012 Maximum	Dec. 31, 2012 Quoted Prices in Active Markets for Identical Assets (Level 1)	Dec. 31, 2011 Quoted Prices in Active Markets for Identical Assets (Level 1)	Dec. 31, 2012 Significant Other Observable Inputs (Level 2)	Dec. 31, 2011 Significant Other Observable Inputs (Level 2)	Dec. 31, 2012 Significant Unobservable Inputs (Level 3)	Dec. 31, 2011 Significant Unobservable Inputs (Level 3)	Dec. 31, 2012 Equity securities	Dec. 31, 2011 Equity securities	Dec. 31, 2012 Equity securities Quoted Prices in Active Markets for Identical Assets (Level 1)	Dec. 31, 2011 Equity securities Quoted Prices in Active Markets for Identical Assets (Level 1)	Dec. 31, 2012 Equity securities Significant Other Observable Inputs (Level 2)	Dec. 31, 2011 Equity securities Significant Other Observable Inputs (Level 2)	Dec. 31, 2012 Equity securities Significant Unobservable Inputs (Level 3)	Dec. 31, 2011 Equity securities Significant Unobservable Inputs (Level 3)	Dec. 31, 2012 Debt securities	Dec. 31, 2011 Debt securities	Dec. 31, 2012 Debt securities Quoted Prices in Active Markets for Identical Assets (Level 1)	Dec. 31, 2011 Debt securities Quoted Prices in Active Markets for Identical Assets (Level 1)	Dec. 31, 2012 Debt securities Significant Other Observable Inputs (Level 2)	Dec. 31, 2011 Debt securities Significant Other Observable Inputs (Level 2)	Dec. 31, 2012 Debt securities Significant Unobservable Inputs (Level 3)	Dec. 31, 2011 Debt securities Significant Unobservable Inputs (Level 3)	Dec. 31, 2012 Other	Dec. 31, 2011 Other	Dec. 31, 2012 Other Quoted Prices in Active Markets for Identical Assets (Level 1)	Dec. 31, 2011 Other Quoted Prices in Active Markets for Identical Assets (Level 1)	Dec. 31, 2012 Other Significant Other Observable Inputs (Level 2)	Dec. 31, 2011 Other Significant Other Observable Inputs (Level 2)	Dec. 31, 2012 Other Significant Unobservable Inputs (Level 3)	Dec. 31, 2011 Other Significant Unobservable Inputs (Level 3)
Employee Benefits Plans
Fair value of plan assets	$ 102,174	$ 93,002			$ 102,026	$ 93,002	$ 148	$ 0	$ 0	$ 0	$ 64,565	$ 59,659	$ 64,565	$ 59,659	$ 0	$ 0	$ 0	$ 0	$ 30,881	$ 28,238	$ 30,881	$ 28,238	$ 0	$ 0	$ 0	$ 0	$ 6,728	$ 5,105	$ 6,580	$ 5,105	$ 148	$ 0	$ 0	$ 0
Funded pension plan assets, by asset category (as a percent)	100.00%	100.00%									63.00%	64.00%							30.00%	30.00%							7.00%	6.00%
Period to meet policy goals			3 years	5 years