XML 122 R97.htm IDEA: XBRL DOCUMENT v3.8.0.1
DEBT AND FINANCING ARRANGEMENTS - Debt maturity (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Scheduled debt maturity    
2018 $ 0  
2019 250,000  
2020 500,000  
2021 0  
2022 0  
After 2022 636,060  
Unamortized discount and debt issuance expenses (9,531)  
Total senior notes and notes payable $ 1,376,529 $ 992,950