Lease Obligations (Narrative) (Details) - USD ($) |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2015 |
Dec. 31, 2014 |
Dec. 31, 2013 |
|
| Operating Leased Assets [Line Items] | |||
| Rent expenses | $ 678,000 | $ 609,000 | $ 428,000 |
| Office Space [Member] | |||
| Operating Leased Assets [Line Items] | |||
| Minimum rental payment for lease | $ 651,000 | ||