Annual report pursuant to Section 13 and 15(d)

Segment Reporting (Narrative) (Details)

v3.19.3.a.u2
Segment Reporting (Narrative) (Details)
3 Months Ended 12 Months Ended
Dec. 31, 2019
USD ($)
Sep. 30, 2019
USD ($)
Jun. 30, 2019
USD ($)
Mar. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Sep. 30, 2018
USD ($)
Jun. 30, 2018
USD ($)
Mar. 31, 2018
USD ($)
Dec. 31, 2019
USD ($)
segment
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Segment Reporting Information [Line Items]                      
Number of business segments | segment                 2    
Total revenues $ 86,673,000 $ 87,391,000 $ 86,605,000 $ 90,266,000 $ 90,277,000 $ 90,951,000 $ 86,207,000 $ 98,279,000 $ 350,935,000 $ 365,714,000 $ 459,030,000
Foreign Locations [Member]                      
Segment Reporting Information [Line Items]                      
Total revenues                 0 0 $ 0
Long lived assets $ 0       $ 0       $ 0 $ 0