CONSOLIDATED STATEMENTS OF FINANCIAL POSITION (Parentheticals) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Property, plant and equipment, accumulated depreciation and amortization	$ 1,487,713	$ 1,388,217
Intangible assets, accumulated amortization	28,242	24,917
Deferred financing fees, accumulated amortization	$ 17,515	$ 15,972
Common stock, without par value	$ 0	$ 0
Common stock, shares authorized	300,000,000	300,000,000
Common stock, shares issued	152,699,077	155,140,967
Common stock, shares outstanding	152,699,077	155,140,967