COMMON STOCK SARs Fair Value Assumptions (Details) - Stock Appreciation Rights (SARs) [Member] - $ / shares	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Terms of Award	The SARs vest ratably over a three-year period and may be exercised at any point after vesting through ten years from the date of issuance. Pursuant to the terms of the awards, upon exercise, the executive officers will receive, in shares of common stock, the excess of the market price of the award on the date of exercise over the market price of the award on the date of issuance.
Expected term of award	6 years	5 years 2 months 14 days	6 years
Risk-free interest rate	1.80%	1.40%	2.10%
Expected Volatility	54.50%	58.00%	65.60%
Weighted-average grant date fair value per share	$ 26.96	$ 22.23	$ 29.96