Segment Reporting (Narrative) (Details) |
3 Months Ended | 9 Months Ended | |||
|---|---|---|---|---|---|
|
Sep. 30, 2018
USD ($)
|
Sep. 30, 2017
USD ($)
|
Sep. 30, 2018
USD ($)
segment
|
Sep. 30, 2017
USD ($)
|
Dec. 31, 2017
USD ($)
|
|
| Segment Reporting Information [Line Items] | |||||
| Number of business segments | segment | 2 | ||||
| Total revenues | $ 132,114,000 | $ 160,018,000 | $ 397,670,000 | $ 472,671,000 | |
| Foreign Locations [Member] | |||||
| Segment Reporting Information [Line Items] | |||||
| Total revenues | 0 | $ 0 | |||
| Long lived assets | $ 0 | $ 0 | $ 0 | ||