|
Income taxes (Reconciliation of the Differences Due to Federal Statutory Rate) (Details) (USD $)
In Thousands, unless otherwise specified |
0 Months Ended | 12 Months Ended | ||
|---|---|---|---|---|
|
Jun. 30, 2013
|
Dec. 31, 2014
|
Dec. 31, 2013
|
Dec. 31, 2012
|
|
| Income Tax Disclosure [Abstract] | ||||
| Expected federal income tax credit at statutory rates | $ (1,370) | $ (238) | $ (2,050) | |
| State income taxes, net of federal effect | (179) | (33) | (263) | |
| Effect of nontaxable income, net | 489 | 547 | 583 | |
| Valuation allowance for deferred tax assets | 0 | 0 | 10,762 | |
| Reversal of valuation allowance | (41,600) | 0 | 41,632 | 0 |
| Section 382 impairment re-evaluation | 0 | 8,163 | (8,163) | |
| Tax affected disallowed merger costs | (974) | 0 | 0 | |
| Rate change for deferred taxes | 1,687 | 52 | (814) | |
| Other, net | 169 | 23 | (134) | |
| Benefit (provision) for income taxes | $ (178) | $ 50,146 | $ (79) | |