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Segment and Geographic Information Segment and Geographic Information (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Segment Reporting Information [Line Items]                      
Sales to external customers                 $ 1,177,438 $ 1,014,152 $ 794,585
Depreciation and amortization expense                 40,389 32,196 27,915
Operating income (loss) 39,781 35,886 32,979 27,351 32,837 32,032 33,083 23,861 135,997 121,813 89,994
Total assets (1) 1,461,630 [1]       1,327,841 [1]       1,461,630 [1] 1,327,841 [1] 1,174,475 [1]
Capital expenditures                 72,585 43,685 22,380
Segments, Geographical Areas [Abstract]                      
Property, plant and equipment, net 224,205       169,776       224,205 169,776 137,301
Energy & Chemicals [Member]
                      
Segment Reporting Information [Line Items]                      
Sales to external customers                 318,510 323,676 205,033
Depreciation and amortization expense                 8,564 7,877 7,417
Operating income (loss)                 59,671 64,931 27,489
Total assets (1) 277,760 [1]       203,044 [1]       277,760 [1] 203,044 [1] 203,067 [1]
Capital expenditures                 34,194 9,519 5,228
Distribution & Storage [Member]
                      
Segment Reporting Information [Line Items]                      
Sales to external customers                 592,616 475,576 390,332
Depreciation and amortization expense                 15,237 12,599 11,767
Operating income (loss)                 93,560 79,175 61,415
Total assets (1) 676,484 [1]       607,252 [1]       676,484 [1] 607,252 [1] 556,688 [1]
Capital expenditures                 32,039 30,048 7,808
BioMedical [Member]
                      
Segment Reporting Information [Line Items]                      
Sales to external customers                 266,312 214,900 199,220
Depreciation and amortization expense                 14,618 10,204 7,588
Operating income (loss)                 33,039 24,079 35,911
Total assets (1) 431,763 [1]       447,792 [1]       431,763 [1] 447,792 [1] 226,729 [1]
Capital expenditures                 3,370 2,717 6,692
Corporate [Member]
                      
Segment Reporting Information [Line Items]                      
Sales to external customers                 0 0 0
Depreciation and amortization expense                 1,970 1,516 1,143
Operating income (loss)                 (50,273) (46,372) (34,821)
Total assets (1) 75,623 [1]       69,753 [1]       75,623 [1] 69,753 [1] 187,991 [1]
Capital expenditures                 2,982 1,401 2,652
Heat exchangers - Brazed aluminum [Member] | Energy & Chemicals [Member]
                      
Segment Reporting Information [Line Items]                      
Sales to external customers                 170,104 146,110 92,013
Heat exchangers - Air cooled [Member] | Energy & Chemicals [Member]
                      
Segment Reporting Information [Line Items]                      
Sales to external customers                 54,275 69,977 66,962
Cold boxes [Member] | Energy & Chemicals [Member]
                      
Segment Reporting Information [Line Items]                      
Sales to external customers                 94,131 107,589 46,058
Cryogenic bulk storage systems [Member] | Distribution & Storage [Member]
                      
Segment Reporting Information [Line Items]                      
Sales to external customers                 175,123 153,372 153,518
Cryogenic packaged gas systems and beverage liquid CO2 systems [Member] | Distribution & Storage [Member]
                      
Segment Reporting Information [Line Items]                      
Sales to external customers                 152,922 143,548 142,262
LNG applications [Member] | Distribution & Storage [Member]
                      
Segment Reporting Information [Line Items]                      
Sales to external customers                 193,032 107,231 35,678
Cryogenic systems, components and services [Member] | Distribution & Storage [Member]
                      
Segment Reporting Information [Line Items]                      
Sales to external customers                 71,539 71,425 58,874
Medical respiratory products [Member] | BioMedical [Member]
                      
Segment Reporting Information [Line Items]                      
Sales to external customers                 175,233 143,878 138,411
Biological storage systems [Member] | BioMedical [Member]
                      
Segment Reporting Information [Line Items]                      
Sales to external customers                 61,493 64,449 60,809
On-site oxygen generation systems [Member] | BioMedical [Member]
                      
Segment Reporting Information [Line Items]                      
Sales to external customers                 29,586 6,573 0
United States [Member]
                      
Segment Reporting Information [Line Items]                      
Sales to external customers                 479,067 438,294 334,517
Segments, Geographical Areas [Abstract]                      
Property, plant and equipment, net 146,610       98,425       146,610 98,425 75,848
China [Member]
                      
Segment Reporting Information [Line Items]                      
Sales to external customers                 231,143 149,010 92,142
Segments, Geographical Areas [Abstract]                      
Property, plant and equipment, net 38,569       34,158       38,569 34,158 23,410
Rest of World [Member]
                      
Segment Reporting Information [Line Items]                      
Sales to external customers                 467,228 426,848 367,926
Czech Republic [Member]
                      
Segments, Geographical Areas [Abstract]                      
Property, plant and equipment, net 23,623       21,559       23,623 21,559 21,805
Germany [Member]
                      
Segments, Geographical Areas [Abstract]                      
Property, plant and equipment, net 14,618       14,402       14,618 14,402 14,672
Other Non-U.S. Countries [Member]
                      
Segments, Geographical Areas [Abstract]                      
Property, plant and equipment, net $ 785       $ 1,232       $ 785 $ 1,232 $ 1,566
[1] Corporate assets consist primarily of cash, cash equivalents and deferred income taxes.