Employee Benefit Plans (Details 12) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Employee Benefit Plans [Line Items]
Fair value of the assets (by asset category) in the Company's defined benefit pension plan	$ 99,857	$ 87,605
Level 1
Employee Benefit Plans [Line Items]
Fair value of the assets (by asset category) in the Company's defined benefit pension plan	12,909	10,773
Level 2
Employee Benefit Plans [Line Items]
Fair value of the assets (by asset category) in the Company's defined benefit pension plan	86,948	76,832
Level 3
Employee Benefit Plans [Line Items]
Fair value of the assets (by asset category) in the Company's defined benefit pension plan	0	0
Mutual funds
Employee Benefit Plans [Line Items]
Fair value of the assets (by asset category) in the Company's defined benefit pension plan	12,909	10,773
Mutual funds | Level 1
Employee Benefit Plans [Line Items]
Fair value of the assets (by asset category) in the Company's defined benefit pension plan	12,909	10,773
Mutual funds | Level 2
Employee Benefit Plans [Line Items]
Fair value of the assets (by asset category) in the Company's defined benefit pension plan	0	0
Mutual funds | Level 3
Employee Benefit Plans [Line Items]
Fair value of the assets (by asset category) in the Company's defined benefit pension plan	0	0
Money market fund
Employee Benefit Plans [Line Items]
Fair value of the assets (by asset category) in the Company's defined benefit pension plan	779	1,659
Money market fund | Level 1
Employee Benefit Plans [Line Items]
Fair value of the assets (by asset category) in the Company's defined benefit pension plan	0	0
Money market fund | Level 2
Employee Benefit Plans [Line Items]
Fair value of the assets (by asset category) in the Company's defined benefit pension plan	779	1,659
Money market fund | Level 3
Employee Benefit Plans [Line Items]
Fair value of the assets (by asset category) in the Company's defined benefit pension plan	0	0
Equity based
Employee Benefit Plans [Line Items]
Fair value of the assets (by asset category) in the Company's defined benefit pension plan	40,807	39,573
Equity based | Level 1
Employee Benefit Plans [Line Items]
Fair value of the assets (by asset category) in the Company's defined benefit pension plan	0	0
Equity based | Level 2
Employee Benefit Plans [Line Items]
Fair value of the assets (by asset category) in the Company's defined benefit pension plan	40,807	39,573
Equity based | Level 3
Employee Benefit Plans [Line Items]
Fair value of the assets (by asset category) in the Company's defined benefit pension plan	0	0
Fixed income securities
Employee Benefit Plans [Line Items]
Fair value of the assets (by asset category) in the Company's defined benefit pension plan	45,362	35,600
Fixed income securities | Level 1
Employee Benefit Plans [Line Items]
Fair value of the assets (by asset category) in the Company's defined benefit pension plan	0	0
Fixed income securities | Level 2
Employee Benefit Plans [Line Items]
Fair value of the assets (by asset category) in the Company's defined benefit pension plan	45,362	35,600
Fixed income securities | Level 3
Employee Benefit Plans [Line Items]
Fair value of the assets (by asset category) in the Company's defined benefit pension plan	$ 0	$ 0