Employee Benefit Plans (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Pension Plans, Defined Benefit [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Projected benefit obligation	$ 13,278		$ 13,695
Before Settlement	13,903
Impact of Settlements	(625)
Fair value of plan assets	7,829		8,259
Before Settlement	8,454
Impact of Settlements	(625)
Funded status	(5,449)		(5,436)
Gross unrealized loss (gain)	5,705		5,979
Before Settlement	5,974
Discount rate	3.40%		3.50%
Expected return on plan assets	7.50%		7.50%
Components of net periodic benefit costs:
Interest cost	115	143
Expected return on plan assets	(130)	(169)
Amortization of net loss	33	33
Settlement of benefit obligation	(269)	(486)
Net periodic benefit cost	287	493
Other Postretirement Benefit Plans, Defined Benefit [Member]
Components of net periodic benefit costs:
Interest cost	1	1
Amortization of net loss	(1)	(2)
Net periodic benefit cost	$ 0	$ (1)
Other Postretirement Benefit Plans, Defined Benefit [Member] | Employees Hired before January 1, 2003 [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Benefit based on highest average salary for number of consecutive years	5 years
Number of years for consecutive years calculation	10 years
Other Postretirement Benefit Plans, Defined Benefit [Member] | Employees Hired on or after January 1, 2003 [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Percent of annual salary to calculate benefit	2.00%