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Intangible Assets (Details 2) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Total currently estimated annual amortization expense  
2015 $ 18,166us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths
2016 17,957us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo
2017 17,079us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree
2018 17,030us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour
2019 16,001us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive
2020 $ 11,762hw_FiniteLivedIntangibleAssetsAmortizationExpenseYearSix