Employee Benefit Plans (Details 12) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Employee Benefit Plans [Line Items]
Fair value of the assets (by asset category) in the Company's defined benefit pension plan	$ 116,022	$ 110,862
Level 1
Employee Benefit Plans [Line Items]
Fair value of the assets (by asset category) in the Company's defined benefit pension plan	0	15,898
Level 2
Employee Benefit Plans [Line Items]
Fair value of the assets (by asset category) in the Company's defined benefit pension plan	116,022	94,964
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		15,898
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		15,898
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
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
Money market fund
Employee Benefit Plans [Line Items]
Fair value of the assets (by asset category) in the Company's defined benefit pension plan	2,478	987
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	2,478	987
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		40,702
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
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		40,702
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
Fixed income securities
Employee Benefit Plans [Line Items]
Fair value of the assets (by asset category) in the Company's defined benefit pension plan	113,544	53,275
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	113,544	53,275
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