Net Periodic Benefit Cost-Defined Benefit Plans (Details) (USD $)	3 Months Ended		12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013
Net periodic benefit cost of the domestic non-contributory defined benefit plan
Service cost	$ 140,000	$ 159,000
Interest cost	215,000	193,000
Expected return on plan assets	(288,000)	(246,000)
Amortization of prior service cost	0	7,000
Amortization of net loss	52,000	119,000
Net periodic cost	119,000	232,000
Expected contribution to Pension Plan in 2014			600,000
Employer contributions made to the defined benefit plan	205,000
Minimum additional contributions anticipated during the remainder of 2014	$ 395,000