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Schedule 1 - Condensed Financial Information of Registrant - Condensed Balance Sheets, Parent Company (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | --- | ---
Assets |  |  |  |
Cash and Cash Equivalents | $ 21,199 | $ 861 | $ 16,216 | $ 0
Accounts Receivable | 77,947 | 75,144 |  |
Accounts Receivable from Subsidiaries | 2,144 | 1,931 |  |
Interest Receivable from Subsidiaries | 117 | 117 |  |
Notes Receivable from Subsidiaries | 0 | 1,167 |  |
Income Taxes Receivable | 1,487 | 2,439 |  |
Other | 5,042 | 6,114 |  |
Total Current Assets | 254,860 | 241,420 |  |
Investments in Subsidiaries | 9,894 | 8,961 |  |
Notes Receivable from Subsidiaries | 79,251 | 79,422 |  |
Operating Lease, Right-of-Use Asset | 21,851 | 0 |  |
Other Assets | 40,196 | 35,759 |  |
Identifiable Assets | 2,273,595 | 2,052,517 | 2,004,278 |
Liabilities and Equity |  |  |  |
Short-Term Debt | 6,000 | 18,599 |  |
Less: Current Maturities--net of Unamortized Debt Issuance Costs | 183 | 172 |  |
Accounts Payable to Subsidiaries | 7 | 7 |  |
Notes Payable to Subsidiaries | 89,611 | 60,626 |  |
Current Operating Lease Liabilities | 4,136 | 0 |  |
Other | 10,912 | 12,149 |  |
Total Current Liabilities | 189,741 | 170,093 |  |
Long Term Operating Lease Liabilities | 18,193 | 0 |  |
Other Noncurrent Liabilities | 30,833 | 24,326 |  |
Capitalization |  |  |  |
Total Long-Term Debt net of Unamortized Debt Issuance Costs | 689,581 | 590,002 |  |
Common Shareholder Equity | 781,482 | 728,863 | 696,892 | 670,104
Capitalization, Long-term Debt and Equity, Total | 1,471,063 | 1,318,865 |  |
Total Liabilities and Equity | 2,273,595 | 2,052,517 |  |
Parent Company [Member] |  |  |  |
Assets |  |  |  |
Cash and Cash Equivalents | 4,959 | 0 | $ 16,371 | $ 6,218
Accounts Receivable | 0 | 0 |  |
Accounts Receivable from Subsidiaries | 2,144 | 1,931 |  |
Interest Receivable from Subsidiaries | 117 | 117 |  |
Notes Receivable from Subsidiaries | 0 | 1,167 |  |
Income Taxes Receivable | 1,487 | 0 |  |
Other | 1,050 | 3,482 |  |
Total Current Assets | 9,757 | 6,697 |  |
Investments in Subsidiaries | 860,646 | 787,869 |  |
Notes Receivable from Subsidiaries | 79,251 | 79,422 |  |
Deferred Income Taxes | 25,505 | 21,100 |  |
Operating Lease, Right-of-Use Asset | 637 | 0 |  |
Other Assets | 35,503 | 31,547 |  |
Identifiable Assets | 1,011,299 | 926,635 |  |
Liabilities and Equity |  |  |  |
Short-Term Debt | 6,000 | 9,215 |  |
Less: Current Maturities--net of Unamortized Debt Issuance Costs | 183 | 172 |  |
Accounts Payable to Subsidiaries | 7 | 7 |  |
Notes Payable to Subsidiaries | 89,611 | 60,626 |  |
Current Operating Lease Liabilities | 156 | 0 |  |
Other | 9,473 | 9,994 |  |
Total Current Liabilities | 105,430 | 80,014 |  |
Long Term Operating Lease Liabilities | 533 | 0 |  |
Other Noncurrent Liabilities | 44,042 | 37,814 |  |
Capitalization |  |  |  |
Total Long-Term Debt net of Unamortized Debt Issuance Costs | 79,812 | 79,944 |  |
Common Shareholder Equity | 781,482 | 728,863 |  |
Capitalization, Long-term Debt and Equity, Total | 861,294 | 808,807 |  |
Total Liabilities and Equity | $ 1,011,299 | $ 926,635 |  |

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