Pension Plans and Other Postretirement Benefits (Details Textual) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2006
Pension Plans and Other Postretirement Benefits (Textual) [Abstract]
Reduction in expense due to changes in the plan for other postretirement benefits	$ 144	$ 431	$ 379
Pension Plans and Other Postretirement Benefits (Additional Textual) [Abstract]
Employer contribution as percentage of eligible compensation for hired on or after April 1, 1997	5.00%
Minimum period of service, for employees hired prior to April 1, 1997, to have defined benefit plan contribution percentage calculated at 7% of eligible compensation	15 years
Employer contribution as percentage of eligible compensation for employees hired prior to April 1, 1997 having more than 15 years of service	7.00%
Highest number of consecutive months of earnings used to calculate amounts earned when defined benefit and supplemental defined benefit plans were frozen	36 months
Total expense recorded for plans	10,295	10,415	12,353
Health reimbursement account balance	2,746			7,310
Health reimbursement accounts funding	181	168	184
Total Fixed Maturities [Member]
Pension Plans and Other Postretirement Benefits (Textual) [Abstract]
Defined Benefit Plan, Target Allocation Percentage	50% fixed income funds
Equity Securities [Member]
Pension Plans and Other Postretirement Benefits (Textual) [Abstract]
Defined Benefit Plan, Target Allocation Percentage	50% equity
Defined Benefit Plan [Member]
Pension Plans and Other Postretirement Benefits (Textual) [Abstract]
Employee Vesting Percentage	100.00%
Defined benefit plan vesting percentage of participants	100.00%
Expected amortization of net loss expected in the next fiscal year	1,371
Supplemental Retirement Plans [Member]
Pension Plans and Other Postretirement Benefits (Textual) [Abstract]
Expected amortization of net loss expected in the next fiscal year	158
401 K [Member]
Pension Plans and Other Postretirement Benefits (Textual) [Abstract]
Employee Vesting Percentage	100.00%
401(k) Plan Employer Contribution Percent	3.00%
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent	20.00%
Non-qualified Defined Contribution Plan [Member]
Pension Plans and Other Postretirement Benefits (Textual) [Abstract]
Participants are 100% vested in the Defined Contribution plan after	3 years
Employee Vesting Percentage	100.00%
Pension Costs [Member]
Pension Plans and Other Postretirement Benefits (Textual) [Abstract]
Expected amortization of net loss expected in the next fiscal year	$ 246