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Debt - Debt (Detail) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2016
Dec. 31, 2015
Debt Instrument [Line Items]    
Total debt $ 327,850 $ 331,354
Less current maturities 15,277 18,806
Long-term debt 312,573 312,548
Unsecured private placement 3.95% note [Member]    
Debt Instrument [Line Items]    
Total debt $ 99,626 $ 99,617 [1]
Debt instrument interest rate percentage 3.95% 3.95%
Unsecured private placement 3.95% note [Member] | Minimum [Member]    
Debt Instrument [Line Items]    
Maturity Dates 2021 2021
Unsecured private placement 3.95% note [Member] | Maximum [Member]    
Debt Instrument [Line Items]    
Maturity Dates 2027 2027
Unsecured private placement 3.86% note [Member]    
Debt Instrument [Line Items]    
Total debt $ 99,572 $ 99,560 [1]
Debt instrument interest rate percentage 3.86% 3.86%
Unsecured private placement 3.86% note [Member] | Minimum [Member]    
Debt Instrument [Line Items]    
Maturity Dates 2019 2019
Unsecured private placement 3.86% note [Member] | Maximum [Member]    
Debt Instrument [Line Items]    
Maturity Dates 2025 2025
Unsecured private placement 4.86% note [Member]    
Debt Instrument [Line Items]    
Total debt $ 64,748 $ 64,740 [1]
Debt instrument interest rate percentage 4.86% 4.86%
Unsecured private placement 4.86% note [Member] | Minimum [Member]    
Debt Instrument [Line Items]    
Maturity Dates 2017 2017
Unsecured private placement 4.86% note [Member] | Maximum [Member]    
Debt Instrument [Line Items]    
Maturity Dates 2023 2023
Unsecured private placement 5.88% note [Member]    
Debt Instrument [Line Items]    
Total debt $ 39,865 $ 39,860 [1]
Debt instrument interest rate percentage 5.88% 5.88%
Unsecured private placement 5.88% note [Member] | Minimum [Member]    
Debt Instrument [Line Items]    
Maturity Dates 2016 2016
Unsecured private placement 5.88% note [Member] | Maximum [Member]    
Debt Instrument [Line Items]    
Maturity Dates 2022 2022
Unsecured private placement 5.69% note [Member]    
Debt Instrument [Line Items]    
Total debt $ 17,100 $ 17,096 [1]
Debt instrument interest rate percentage 5.69% 5.69%
Unsecured private placement 5.69% note [Member] | Minimum [Member]    
Debt Instrument [Line Items]    
Maturity Dates 2016 2016
Unsecured private placement 5.69% note [Member] | Maximum [Member]    
Debt Instrument [Line Items]    
Maturity Dates 2018 2018
Unsecured U.S. bank debt [Member]    
Debt Instrument [Line Items]    
Maturity Dates 2019 2019
Debt of foreign subsidiaries Unsecured bank debt, foreign currency [Member]    
Debt Instrument [Line Items]    
Total debt $ 59 $ 4,810
Maturity Dates 2016 2016
Debt of foreign subsidiaries Unsecured bank term loan, foreign currency [Member]    
Debt Instrument [Line Items]    
Total debt $ 3,740 $ 3,724
Maturity Dates 2021 2021
Debt of foreign subsidiaries Secured bank debt, foreign currency [Member]    
Debt Instrument [Line Items]    
Total debt $ 3,140 $ 1,947
Maturity Dates 2015 2015
[1] Certain balances have been restated from those originally reported at December 31, 2015, due to the Company’s January 1, 2016, adoption of the new U.S. GAAP guidance regarding the classification of debt issuance costs. See Note 16 for additional information regarding ASU No. 2015-03.