Annual report pursuant to Section 13 and 15(d)

GUARANTORS OF SECURITIES (Details)

v3.8.0.1
GUARANTORS OF SECURITIES (Details) - Senior Unsecured Notes Due December 15, 2022 - Senior Notes - USD ($)
Dec. 31, 2017
Dec. 31, 2016
Dec. 07, 2012
Debt Instrument [Line Items]      
Face amount     $ 200,000,000.0
Stated interest rate 7.75% 7.75% 7.75%