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Senior Notes	12 Months Ended
Senior Notes	Dec. 31, 2019
Subsidiary Guarantors - Senior Notes [Abstract]
Subsidiary Guarantors Senior Notes [Text Block]	Senior Notes On November 2, 2010, we issued $300 million in senior unsecured notes due November 2020, bearing interest at 6.625%, and on May 2, 2013, we issued $250 million in senior unsecured notes due May 2021, bearing interest at 4.75%. The 6.625% and 4.75% senior notes were redeemed effective August 5, 2019, at a price equal to 100% of their principal amount plus accrued and unpaid interest to, but excluding, the redemption date. As of December 31, 2018, we had $540.0 million in senior notes outstanding, net of unamortized issuance costs. In connection with redeeming the senior unsecured notes, we recorded a write-down of previously unamortized debt issuance costs of approximately $2.0 million in the third quarter of 2019.