Schedule II - Valuation and Qualifying Accounts (Tables)

12 Months Ended

Dec. 31, 2014

Valuation and Qualifying Accounts [Abstract]

Summary of Valuation Allowance [Table Text Block]

	Balance at beginning of period		Charged to expenses		Adjustments to valuation accounts			Deductions			Balance at end of period
Year Ended December 31, 2014
Allowance for uncollectable accounts	$	10,771	$	3,886	$	-		$	(4,289	)	$	10,368
Allowance for deferred tax asset	$	63,712	$	-	$	(29,410	)	$	-		$	34,302
Year Ended December 31, 2013
Allowance for uncollectable accounts	$	16,402	$	3,521	$	-		$	(9,152	)	$	10,771
Allowance for deferred tax asset	$	71,912	$	-	$	(8,200	)	$	-		$	63,712
Year Ended December 31, 2012
Allowance for uncollectable accounts	$	18,059	$	6,309	$	-		$	(7,966	)	$	16,402
Allowance for deferred tax asset	$	66,520	$	-	$	5,392		$	-		$	71,912