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Retirement Plans (Information About Plan Assets) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
UNITED STATES      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Investment Policies and Strategies Narrative Description Plan assets consist primarily of various fixed income and equity investments. The Company's primary investment objective is to provide long-term growth of capital while accepting a moderate level of risk. The investments are limited to cash and cash equivalents, bonds, preferred stocks, and common stocks. The investment target ranges and actual allocation of pension plan assets by major category at December 31, 2016 and 2015 are as follows    
Defined Benefit Plan, Actual Plan Asset Allocations 100.00% 100.00%  
Defined Benefit Plan, Plan Assets at Fair Value, Valuation Techniques In accordance with the fair value disclosure requirements of FASB ASC 820, "Fair Value Measurements and Disclosures," the following assets were measured at fair value on a recurring basis at December 31, 2016 and 2015. Additional information regarding FASB ASC 820 and the fair value hierarchy can be found in Note 18 Fair Value Measurements    
Fair value of plan assets $ 14,180 $ 14,235 $ 15,205
UNITED STATES | Cash and Cash Equivalents [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Investment Strategies, Investment Fund Category Cash and cash equivalents    
Defined Benefit Plan, Target Plan Asset Allocations Range Minimum 0.00%    
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum 10.00%    
Defined Benefit Plan, Actual Plan Asset Allocations 5.00% 9.00%  
Fair value of plan assets $ 660 $ 1,248  
UNITED STATES | Fixed Income Funds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Investment Strategies, Investment Fund Category Total fixed income funds    
Defined Benefit Plan, Target Plan Asset Allocations Range Minimum 25.00%    
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum 50.00%    
Defined Benefit Plan, Actual Plan Asset Allocations 33.00% 35.00%  
Fair value of plan assets $ 4,767 $ 4,926  
UNITED STATES | Corporate Bond Securities [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 4,767 $ 4,926  
UNITED STATES | Equity Funds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Investment Strategies, Investment Fund Category Total mutual funds and equities    
Defined Benefit Plan, Target Plan Asset Allocations Range Minimum 50.00%    
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum 70.00%    
Defined Benefit Plan, Actual Plan Asset Allocations 62.00% 56.00%  
Fair value of plan assets $ 8,753 $ 8,061  
UNITED STATES | Mutual Funds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 8,753 8,061  
UNITED STATES | Asset Allocations, Common Stock [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 0    
UNITED KINGDOM      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Investment Policies and Strategies Narrative Description Plan assets are invested by the trustees in accordance with a written statement of investment principles. This statement permits investment in equities, corporate bonds, United Kingdom government securities, commercial property, and cash, based on certain target allocation percentages. Asset allocation is primarily based on a strategy to provide steady growth without undue fluctuations. The target asset allocation percentages for 2016 are as follows:    
Fair value of plan assets $ 5,826 6,661 $ 6,757
UNITED KINGDOM | Cash and Cash Equivalents [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Investment Strategies, Investment Fund Category Cash    
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum 100.00%    
Fair value of plan assets $ 707 242  
UNITED KINGDOM | Municipal Bonds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Investment Strategies, Investment Fund Category U.K. Government securities    
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum 50.00%    
Fair value of plan assets $ 1,347 1,301  
UNITED KINGDOM | Equity Funds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Investment Strategies, Investment Fund Category Equity securities    
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum 100.00%    
Fair value of plan assets $ 2,617 2,656  
UNITED KINGDOM | Commercial Property [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Investment Strategies, Investment Fund Category Commercial property    
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum 50.00%    
Fair value of plan assets $ 1,155 $ 2,462