Retirement Plans (Schedule of Benefit Obligation, Fair Value of Assets, and Funded Status of the Plans) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
United States Pension Plans of US Entity, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Benefit obligation at beginning of period	$ 18,034	$ 16,986
Service cost	33	31	30
Interest cost	707	748	799
Recognized net actuarial loss	(1,924)	980
Benefits paid	(738)	(711)
Benefit obligation at end of period	16,112	18,034	16,986
Fair value of assets at beginning of period	13,262	12,088
Actual gain (loss) on plan assets	2,019	1,127
Employer contribution	496	758
Fair value of assets at end of period	15,039	13,262	12,088
Funded status at end of period	(1,073)	(4,772)
Amounts recognized in the consolidated balance sheet consist of: Other long-term liabilities	(1,073)	(4,772)
Amounts recognized in accumulated other comprehensive income consist of: Net loss	1,375	4,675
Amounts recognized in accumulated other comprehensive income consist of: Prior service cost	4	4
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), before Tax, Total	1,379	4,679
United Kingdom Benefit Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Benefit obligation at beginning of period	8,034	6,964
Interest cost	348	338	331
Recognized net actuarial loss	162	652
Benefits paid	(247)	(236)
Foreign currency exchange rate changes	153	316
Benefit obligation at end of period	8,450	8,034	6,964
Fair value of assets at beginning of period	6,051	5,160
Actual gain (loss) on plan assets	545	596
Employer contribution	303	297
Foreign currency exchange rate changes	117	234
Fair value of assets at end of period	6,769	6,051	5,160
Funded status at end of period	(1,681)	(1,983)
Amounts recognized in the consolidated balance sheet consist of: Other long-term liabilities	(1,681)	(1,983)
Amounts recognized in accumulated other comprehensive income consist of: Net loss	906	1,176
Amounts recognized in accumulated other comprehensive income consist of: Prior service cost	142	164
Amounts recognized in accumulated other comprehensive income consist of: Transition obligation	(50)	(96)
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), before Tax, Total	$ 998	$ 1,244