Schedule II - Valuation and Qualifying Accounts (Tables)

12 Months Ended

Dec. 31, 2019

Notes Tables

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, 2019
Allowance for deferred tax asset	$	45,413	$	-	$	(2,710	)	$	-		$	42,703
Year Ended December 31, 2018
Allowance for uncollectable accounts (1)	$	17,066	$	9,254	$	-		$	(5,882	)	$	20,438
Allowance for deferred tax asset	$	54,155	$	-	$	(8,742	)	$	-		$	45,413
Year Ended December 31, 2017
Allowance for uncollectable accounts (1)	$	24,175	$	6,641	$	-		$	(13,750	)	$	17,066
Allowance for deferred tax asset	$	95,126	$	-	$	(40,971	)	$	-		$	54,155