Segment Information (Details) - Revenue [Member] |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2016 |
Jun. 30, 2015 |
Jun. 30, 2016 |
Jun. 30, 2015 |
|
| Segment Reporting Information [Line Items] | ||||
| Total consolidated revenue | 100.00% | 100.00% | 100.00% | 100.00% |
| U.S. [Member] | ||||
| Segment Reporting Information [Line Items] | ||||
| Total consolidated revenue | 62.80% | 64.90% | 63.10% | 67.90% |
| Canada [Member] | ||||
| Segment Reporting Information [Line Items] | ||||
| Total consolidated revenue | 3.70% | 8.30% | 4.40% | 7.60% |
| U.K. [Member] | ||||
| Segment Reporting Information [Line Items] | ||||
| Total consolidated revenue | 19.10% | 19.40% | 20.60% | 19.00% |
| Other foreign markets [Member] | ||||
| Segment Reporting Information [Line Items] | ||||
| Total consolidated revenue | 14.40% | 7.40% | 11.90% | 5.50% |