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Subsequent events (Notes)	3 Months Ended
Subsequent events (Notes)	Mar. 31, 2019
Subsequent Events [Abstract]
Subsequent Events [Text Block]	SUBSEQUENT EVENTS On May 9, 2019, it was announced that the Company and Employers Mutual had entered into a definitive merger agreement pursuant to which Employers Mutual will acquire all of the remaining shares of the Company for $36 per share in cash. The transaction is expected to close in the second half of 2019.