Employee Benefit Plans (Components of Net Periodic Pension Cost) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Pension plans
Components of net periodic benefit cost
Service cost — benefits earned during the year	$ 5	$ 6	$ 464
Interest cost on projected benefit obligations	1,842	2,205	2,415
Expected return on plan assets	(2,744)	(3,190)	(3,767)
Amortization of prior service cost	0	0	196
Amortization of net loss	719	645	1,698
Curtailment expense	0	0	984
Settlement expense	806	1,075	0
Net periodic pension cost	628	741	1,990
Other postretirement benefits
Components of net periodic benefit cost
Service cost — benefits earned during the year	154	143	148
Interest cost on projected benefit obligations	255	295	313
Amortization of prior service cost	161	161	161
Net periodic pension cost	$ 570	$ 599	$ 622