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Employee Benefit Plans (Details 4) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
item
Dec. 31, 2013
Dec. 31, 2012
401(K) Plan      
Number of 401(k) employee savings plans 2hwtl_DefinedContributionPlanNumberOfEmployeeSavingsPlans    
Employer's contributions $ 5.1us-gaap_DefinedContributionPlanCostRecognized $ 4.9us-gaap_DefinedContributionPlanCostRecognized $ 4.7us-gaap_DefinedContributionPlanCostRecognized
Union Employees | Maximum      
401(K) Plan      
Company matching employee contributions (as a percent) 10.00%us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent
/ hwtl_DefinedContributionBenefitPlansCategoryOfEmployeesCoveredAxis
= hwtl_UnionEmployeesMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		    
Nonunion Employees      
401(K) Plan      
Company matching employee contributions (as a percent) 6.00%us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent
/ hwtl_DefinedContributionBenefitPlansCategoryOfEmployeesCoveredAxis
= hwtl_NonunionEmployeesMember