Quarterly report pursuant to Section 13 or 15(d)

Goodwill and Other Intangible Assets Intangible Assets (Details)

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Goodwill and Other Intangible Assets Intangible Assets (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Mar. 31, 2013
Acquired Finite-Lived Intangible Assets [Line Items]    
Intangible Assets, Gross $ 170,698 $ 172,272
Intangible Assets, Accumulated Amortization (42,697) (40,356)
Intangible Assets, Net (Excluding Goodwill) 128,001 131,916
Developed Technology Rights [Member]
    
Acquired Finite-Lived Intangible Assets [Line Items]    
Finite-Lived Intangible Assets, Gross 10,837 10,929
Finite-Lived Intangible Assets, Accumulated Amortization (1,779) (1,659)
Finite-Lived Intangible Assets, Net 9,058 9,270
Customer Relationships [Member]
    
Acquired Finite-Lived Intangible Assets [Line Items]    
Finite-Lived Intangible Assets, Gross 100,419 101,355
Finite-Lived Intangible Assets, Accumulated Amortization (30,017) (27,723)
Finite-Lived Intangible Assets, Net 70,402 73,632
Backlog [Member]
    
Acquired Finite-Lived Intangible Assets [Line Items]    
Finite-Lived Intangible Assets, Gross 10,030 10,167
Finite-Lived Intangible Assets, Accumulated Amortization (10,030) (10,167)
Other Intangible Assets [Member]
    
Acquired Finite-Lived Intangible Assets [Line Items]    
Finite-Lived Intangible Assets, Gross 1,629 1,630
Finite-Lived Intangible Assets, Accumulated Amortization (871) (807)
Finite-Lived Intangible Assets, Net 758 823
Trademarks [Member]
    
Acquired Finite-Lived Intangible Assets [Line Items]    
Indefinite-Lived Intangible Assets (Excluding Goodwill) 47,289 47,693
Certification Marks [Member]
    
Acquired Finite-Lived Intangible Assets [Line Items]    
Indefinite-Lived Intangible Assets (Excluding Goodwill) $ 494 $ 498