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Debt (Details Textual) - USD ($)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Debt      
Repayments of Lines of Credit $ 0 $ 38,000,000 $ 0
Redemption of Senior Notes due 2016 0 127,292,000 $ 0
Redemption Of Senior Notes Pretax Charge $ 2,338,000    
Current Unsecured Bank Credit Facility [Member]      
Debt      
Line of Credit Facility, Expiration Date Jul. 30, 2019    
Line of Credit Facility, Maximum Borrowing Capacity $ 150,000,000    
Variable Commitment Fee Charge On Unused Portion Of Credit Facility 0.15%    
Debt Instrument, Basis Spread on Variable Rate 1.15%    
Senior Notes 2015 [Member]      
Debt      
Debt Instrument, Interest Rate, Stated Percentage 4.50%    
Debt Instrument, Face Amount $ 75,000,000    
Debt Instrument, Maturity Date Jun. 15, 2015    
HMEC's Bank Credit Facility [Member]      
Debt      
Line of Credit Facility, Expiration Date Oct. 06, 2015    
Repayments of Lines of Credit $ 113,000    
Senior Notes 2025 [Member]      
Debt      
Debt Instrument, Interest Rate, Stated Percentage 4.50%    
Senior Note 6.05 % [Member] | Senior Notes 2015 [Member]      
Debt      
Debt Instrument, Interest Rate, Stated Percentage 6.05%    
Debt Instrument, Face Amount $ 75,000,000    
Debt Instrument, Maturity Date Jun. 15, 2015    
Senior Note 6.85 % [Member] | Senior Notes 2016 [Member]      
Debt      
Debt Instrument, Interest Rate, Stated Percentage 6.85%    
Debt Instrument, Face Amount $ 125,000,000    
Debt Instrument, Repurchase Date Dec. 23, 2015    
Senior Note 6.85 % [Member] | Senior Notes 2025 [Member]      
Debt      
Debt Instrument, Interest Rate, Stated Percentage 4.50%    
Senior Note 4.50 % [Member] | Senior Notes 2025 [Member]      
Debt      
Debt Instrument, Unamortized Discount $ 603,000 654,000  
Debt Instrument, Interest Rate, Stated Percentage 4.50%    
Debt Instrument, Face Amount $ 250,000,000    
Debt Instrument, Maturity Date Dec. 01, 2025    
Debt Instrument, Interest Rate, Effective Percentage 4.533%    
Debt Instrument Percentage Of Discount On Issuance 0.265%    
Unamortized Debt Issuance Expense $ 2,188,000 $ 2,371,000