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Business Combinations AirSep Acquisition (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended 2 Months Ended 8 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Dec. 31, 2012
Aug. 29, 2013
AirSep [Member]
Aug. 29, 2013
AirSep [Member]
Sep. 30, 2013
AirSep [Member]
Aug. 30, 2012
AirSep [Member]
Business Acquisition [Line Items]                  
Business Acquisition, Percentage of Voting Interests Acquired                 100.00%
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net                 $ 182,450
Business Acquisition, Purchase Price Allocation, Income Taxes Receivable                 2,800
Debt retired                 10,000
Fair value of net assets aquired                 72,687
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]                  
Accounts receivable                 24,280
Inventories                 34,553
Prepaid expenses                 615
Other current assets                 3,837
Property, plant and equipment                 5,342
Other assets                 976
Accounts payable                 (13,728)
Customer advances and billings in excess of contract revenue                 (4,782)
Accrued salaries, wages and benefits                 (1,837)
Other current liabilities                 (254)
Current portion of warranty reserve                 (10,562)
Long-term portion of warranty reserve                 26,471
Net tangible assets acquired                 11,969
Deferred income tax assets                 9,262
Goodwill 399,099   399,099   398,941       109,763
Identifiable intangible assets                 67,000
Long-term deferred tax liability                 (15,544)
Standard Product Warranty Description               five years  
Sales 301,757 254,249 873,671 710,294   14,174 71,043    
Operating Income (Loss) 35,886 32,032 96,216 88,976   20 3,195    
Business Acquisition, Amortization of Stepped Up Inventory Basis             2,638    
Amortization expense 4,825 3,810 14,642 10,130   1,142 4,570    
Management Retention Expenses and Severance Costs           $ 522 $ 2,726