Segment Reporting (Narrative) (Details) |
3 Months Ended | 12 Months Ended | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
|
Dec. 31, 2020
USD ($)
|
Sep. 30, 2020
USD ($)
|
Jun. 30, 2020
USD ($)
|
Mar. 31, 2020
USD ($)
|
Dec. 31, 2019
USD ($)
|
Sep. 30, 2019
USD ($)
|
Jun. 30, 2019
USD ($)
|
Mar. 31, 2019
USD ($)
|
Dec. 31, 2020
USD ($)
segment
|
Dec. 31, 2019
USD ($)
|
Dec. 31, 2018
USD ($)
|
|
| Segment Reporting Information [Line Items] | |||||||||||
| Number of business segments | segment | 2 | ||||||||||
| Total revenues | $ 76,564,000 | $ 79,197,000 | $ 74,197,000 | $ 83,604,000 | $ 88,227,000 | $ 89,038,000 | $ 88,138,000 | $ 91,799,000 | $ 313,562,000 | $ 357,202,000 | $ 371,724,000 |
| Foreign Locations [Member] | |||||||||||
| Segment Reporting Information [Line Items] | |||||||||||
| Total revenues | 0 | 0 | $ 0 | ||||||||
| Long lived assets | $ 0 | $ 0 | $ 0 | $ 0 | |||||||