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Goodwill and Identifiable Intangible Assets (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Goodwill and Identifiable Intangible Assets    
Impairment of goodwill and identifiable intangible assets not subject to amortization $ 0 $ 0
Goodwill    
Balance at the beginning of the period 470,506 346,246
Acquisition of business 16,077 123,193
Adjustment of purchase price allocations (2,006) 1,757
Foreign currency translation of non-USD functional currency subsidiary goodwill (986) (690)
Balance at the end of the period 483,591 470,506
Aviation Segment
    
Goodwill    
Balance at the beginning of the period 109,332 102,509
Acquisition of business   8,028
Adjustment of purchase price allocations 6,500 (1,106)
Foreign currency translation of non-USD functional currency subsidiary goodwill (325) (99)
Balance at the end of the period 115,507 109,332
Marine Segment
    
Goodwill    
Balance at the beginning of the period 69,931 70,522
Foreign currency translation of non-USD functional currency subsidiary goodwill (843) (591)
Balance at the end of the period 69,088 69,931
Land Segment
    
Goodwill    
Balance at the beginning of the period 291,243 173,215
Acquisition of business 16,077 115,165
Adjustment of purchase price allocations (8,506) 2,863
Foreign currency translation of non-USD functional currency subsidiary goodwill 182  
Balance at the end of the period $ 298,996 $ 291,243