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Schedule I - Condensed Financial Information of the Parent (Condensed Statements of Cash Flows) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Operating Activities    
Net cash provided by operating activities $ 52,784 $ 54,622
Investing Activities    
Expenditures for property, plant and equipment (24,664) (20,930)
Net cash used for investing activities (20,262) (18,387)
Financing Activities    
Purchase of treasury shares (3,010) (1,294)
Cash dividends paid (5,132) (4,578)
Other (3) 23
Net cash provided by (used for) financing activities 5,113 (52,578)
Cash and Cash Equivalents    
Total increase (decrease) for the year 37,635 (16,343)
Balance at the beginning of the year 85,257 101,600
Balance at the end of the year 122,892 85,257
Parent Company    
Operating Activities    
Net income 39,632 34,785
Equity in earnings of subsidiaries 41,610 40,681
Parent company only net loss (1,978) (5,896)
Net changes related to operating activities 3,671 (5,496)
Net cash provided by operating activities 1,693 (11,392)
Investing Activities    
Expenditures for property, plant and equipment 0 (12)
Net cash used for investing activities 0 (12)
Financing Activities    
Dividends received from subsidiaries 42,000 8,000
Notes payable to Bellaire (350) (551)
Purchase of treasury shares (3,010) (1,294)
Cash dividends paid (5,132) (4,578)
Other (4) 0
Net cash provided by (used for) financing activities 33,504 1,577
Cash and Cash Equivalents    
Total increase (decrease) for the year 35,197 (9,827)
Balance at the beginning of the year 84,819 94,646
Balance at the end of the year $ 120,016 $ 84,819