EQUITY AND MEZZANINE EQUITY - Share Repurchase Program (Details) - Share Repurchase Program - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Share Repurchase Program
Shares repurchased (in shares)	39	0	329	67
Aggregate cost of common shares repurchased	$ 2,346	$ 0	$ 18,023	$ 3,415
Average price per share (in dollars per share)	$ 59.57	$ 0	$ 54.69	$ 51.26

Equity impact of the value of stock that has been repurchased and retired during the period. The excess of the purchase price over par value can be charged against retained earnings (once the excess is fully allocated to additional paid in capital).

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