|
Financial Derivative Instruments and Risk Management - Offsetting Arrangements (Details) (USD $)
In Thousands, unless otherwise specified
|
Mar. 31, 2015
|
Dec. 31, 2014
|
| Derivative offset in consolidated balance sheet [Abstract] |
|
|
| Gross derivative amounts - fair value of assets |
$ 133 |
$ 256 |
| Gross derivative amounts offset in consolidated balance sheet - fair value of assets |
133 |
256 |
| Net amount - fair value of assets |
0 |
0 |
| Gross derivative amounts - fair value of liabilities |
(13,333) |
(27,376) |
| Gross derivative amounts offset in consolidated balance sheet - fair value of liabilities |
133 |
256 |
| Net amount - fair value of liabilities |
(13,200) |
(27,120) |
| Net amount - margin call deposits |
5,300 |
14,390 |
| Net amount - Total |
(7,900) |
(12,730) |
| Derivative eligible for offsetting [Abstract] |
|
|
| Gross derivative amount - fair value of assets |
133 |
256 |
| Gross derivative amounts offset in consolidated balance sheet - fair value of assets |
(133) |
(256) |
| Gross derivative amounts - fair value of liabilities |
(13,333) |
(27,376) |
| Gross derivative amounts offset in consolidated balance sheet - fair value of liabilities |
133 |
256 |
| Net amount - Total |
$ 7,900 |
$ 12,730 |