Long-Term Debt - Term Loan (Details) |
Jun. 30, 2016
USD ($)
|
Dec. 31, 2015
USD ($)
|
Sep. 30, 2015
USD ($)
|
Oct. 31, 2012
USD ($)
bank
|
|---|---|---|---|---|
| Debt Instrument [Line Items] | ||||
| Number of banks | bank | 2 | |||
| Term Loan | ||||
| Debt Instrument [Line Items] | ||||
| Weighted average interest rate | 2.38% | |||
| Term Loan | Variable Rate Construction Term Loan | ||||
| Debt Instrument [Line Items] | ||||
| Original principal amount | $ 47,234,000 | |||
| Debt outstanding | $ 37,116,000 | |||
| Weighted average interest rate | 3.64% | |||
| Term Loan | 2015 Variable Rate Construction Term Loan | ||||
| Debt Instrument [Line Items] | ||||
| Original principal amount | $ 20,746,000 | |||
| Debt outstanding | $ 17,663,000 | |||
| Term Loan | 2015 Variable Rate Term Loan | ||||
| Debt Instrument [Line Items] | ||||
| Debt outstanding | $ 20,572,000 | |||
| Weighted average interest rate | 3.13% |