Debt - Capacity on Credit Facility (Details) - Secured Debt - Credit Facility |
Oct. 15, 2014
USD ($)
|
Dec. 31, 2015
USD ($)
|
Nov. 13, 2015
USD ($)
|
Dec. 31, 2014
USD ($)
|
|---|---|---|---|---|
| Line of Credit Facility [Line Items] | ||||
| Maximum alternative leverage ratio | 5.0 | |||
| Maximum leverage ratio | 4.50 | |||
| Maximum borrowing capacity | $ 300,000,000 | $ 400,000,000 | ||
| Secured Debt | ||||
| Line of Credit Facility [Line Items] | ||||
| Amounts outstanding | $ 41,500,000 | $ 81,400,000 | ||
| Available credit facility capacity | 157,500,000 | 218,600,000 | ||
| Revolving Credit Facility | ||||
| Line of Credit Facility [Line Items] | ||||
| Maximum borrowing capacity | $ 200,000,000 | 400,000,000 | 300,000,000 | |
| Amounts outstanding | 201,000,000 | 0 | ||
| Letter of Credit | ||||
| Line of Credit Facility [Line Items] | ||||
| Amounts outstanding | $ 0 | $ 0 |