Long-Term Obligations (Details) - Revolving credit facility $ in Millions |
6 Months Ended |
|---|---|
|
Jun. 30, 2017
USD ($)
| |
| Long-Term Obligations | |
| Outstanding borrowings | $ 0.0 |
| Commitment fee for quarterly unused capacity (as a percent) | 0.25% |
| Unused line of credit fee threshold | $ 15.0 |
| Prime Rate | |
| Long-Term Obligations | |
| Variable interest rate basis | Prime Rate |
| LIBOR | |
| Long-Term Obligations | |
| Variable interest rate basis | LIBOR |
| 2016 Loan Agreement | |
| Long-Term Obligations | |
| Maximum borrowing capacity | $ 30.0 |
| Minimum | Prime Rate | |
| Long-Term Obligations | |
| Basis spread on variable rate (as a percent) | 0.00% |
| Minimum | LIBOR | |
| Long-Term Obligations | |
| Basis spread on variable rate (as a percent) | 2.50% |
| Maximum | Prime Rate | |
| Long-Term Obligations | |
| Basis spread on variable rate (as a percent) | 0.25% |
| Maximum | LIBOR | |
| Long-Term Obligations | |
| Basis spread on variable rate (as a percent) | 2.75% |