Retirement and Benefit Plans (Details) (USD $)	12 Months Ended
	Dec. 31, 2013 Times Participants	Dec. 31, 2012	Dec. 31, 2011
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Death Benefit Only Plan, Benefit Payment as Multiplier of Final Earnings, Current Employee	3
Maximum percentage of matching contribution for total compensation	3.00%
Percentage Quarterly Contributions Of Qualified Wages, Current Quarter And Thereafter	1.00%
Contribution expense	$ 3,126,000	$ 3,620,000	$ 5,599,000
Defined Benefit Plan, Number of Participants Unaffected by Plan Conversion	3
Accumulated other comprehensive income (loss)	5,414,000	6,785,000
Accumulated other comprehensive income, net change	1,371,000
Net periodic benefit (income) costs	(478,000)
Defined Benefit Plan, Death Benefit Only Plan, Benefit Payment as Multiplier of Final Earnings, Post-Employment	1
Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Company matching employee contributions	66.70%
Supplemental Executive Retirement Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Rate, interest credited	0.00%
Projected benefit obligation, unfunded plan	27,439,000	27,851,000
Accumulated benefit obligation	27,439,000	27,851,000
Assumption, future salary increase rate	4.00%
Assumed discount rate	4.95%	4.05%
Retirement age	65
Interest cost	(236,000)	(187,000)	(904,000)
Benefit payments	398,000	398,000	410,000
Net periodic benefit (income) costs	(14,000)	370,000	1,765,000
Death Benefit Only Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Benefit obligation expense	(259,000)	(509,000)	(536,000)
Service cost and accrual adjustments	(364,000)	(412,000)	(449,000)
Netherlands Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Retirement age	65
European Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Amounts recognized in other comprehensive income (loss)	$ 205,000	$ 105,000	$ 215,000