XML 52 R38.htm IDEA: XBRL DOCUMENT v3.6.0.2
Long-Term Debt, Schedule of Long-Term Debt (Details) - USD ($)
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Debt Instrument [Line Items]    
Long-term Debt $ 725,986,000 $ 778,834,000
Unamortized debt issuance costs (3,184,000) (3,985,000)
Total 722,802,000 774,849,000
Revolving Credit Facility Due April 30, 2020 [Member]    
Debt Instrument [Line Items]    
Credit facility, amount outstanding $ 225,986,000 278,834,000
Credit facility, expiration date Apr. 30, 2020  
Long term debt, face amount $ 550,000,000  
Senior Notes Series A Due February 27, 2020 [Member]    
Debt Instrument [Line Items]    
Credit facility, amount outstanding $ 150,000,000 150,000,000
Credit facility, expiration date Feb. 27, 2020  
Long term debt, face amount $ 150,000,000  
Senior Notes Series B Due February 27, 2023 [Member]    
Debt Instrument [Line Items]    
Credit facility, amount outstanding $ 350,000,000 350,000,000
Credit facility, expiration date Feb. 27, 2023  
Long term debt, face amount $ 350,000,000  
Credit Line Due June 30, 2017 [Member]    
Debt Instrument [Line Items]    
Credit facility, amount outstanding $ 0 0
Credit facility, expiration date Jun. 30, 2017  
Long term debt, face amount $ 10,000,000  
Revolving Credit Facility [Member]    
Debt Instrument [Line Items]    
Long term debt, face amount   $ 550,000,000