Retirement and Employee Benefit Plans (Amounts Recognized in Other Comprehensive Income) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Net actuarial loss arising during the year	$ 17,454
Amortization of prior service cost	104
Amortization of net loss	1,541
Settlements	70
Tax effect	(7,535)
Total	11,634
Other Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Net actuarial loss arising during the year	1,706
Amortization of prior service cost	14
Amortization of net loss	120
Tax effect	(721)
Total	$ 1,119