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SCHEDULE I - CONDENSED FINANCIAL INFORMATION OF PARENT (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Assets        
Cash and equivalents $ 7,141 $ 214 $ 436  
Income taxes receivable and other receivables 2,164 4,737    
Total current assets 131,468 155,463    
Deferred taxes and other assets 5,322 5,667    
Total Assets 1,501,433 1,416,734    
Liabilities and Capitalization        
Notes payable to bank 0 59,000    
Income taxes payable 360 225    
Other Liabilities, Current 10,731 15,109    
Total current liabilities 146,585 156,662    
Notes payable to banks 95,500 0    
Deferred Tax Liabilities, Net, Noncurrent 114,216 115,703    
Liabilities, Noncurrent 515,538 409,088    
Common shareholders' equity 558,223 529,945 $ 494,297 $ 465,945
Total capitalization 839,310 850,984    
Total Capitalization and Liabilities 1,501,433 1,416,734    
Parent Company        
Assets        
Cash and equivalents 34 48    
Inter-company loan receivables 76,072 45,955    
Total current assets 76,106 46,003    
Deferred taxes and other assets 8,769 8,422    
Investments in subsidiaries 574,330 539,332    
Total Assets 659,205 593,757    
Liabilities and Capitalization        
Notes payable to bank 0 59,000    
Income taxes payable 3,672 2,780    
Intercompany payable 0 73    
Other Liabilities, Current 291 509    
Total current liabilities 3,963 62,362    
Notes payable to banks 95,500 0    
Income taxes payable and other liabilities 1,519 1,450    
Liabilities, Noncurrent 97,019 1,450    
Common shareholders' equity 558,223 529,945    
Total capitalization 558,223 529,945    
Total Capitalization and Liabilities $ 659,205 $ 593,757