BASIS OF PRESENTATION OF UNAUDITED INTERIM CONDENSED CONSOLIDATED FINANCIAL STATEMENTS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES: Prior Period Adjustments (Details) $ in Millions	3 Months Ended
	Mar. 31, 2016 USD ($)
Adjustment for Prior Period Errors, Interest Expense
Quantifying Misstatement in Current Year Financial Statements [Line Items]
Increase (decrease) to current period statement of operations	$ (0.6)
Adjustment for Prior Period Errors, Site Operating Expenses
Quantifying Misstatement in Current Year Financial Statements [Line Items]
Increase (decrease) to current period statement of operations	(0.5)
Adjustment for Prior Period Errors, Depreciation Expense
Quantifying Misstatement in Current Year Financial Statements [Line Items]
Increase (decrease) to current period statement of operations	0.3
Adjustment for Prior Period Errors, Net Income
Quantifying Misstatement in Current Year Financial Statements [Line Items]
Increase (decrease) to current period statement of operations	$ 0.8