|
Income taxes (Narrative) (Details) (USD $)
|
0 Months Ended |
12 Months Ended |
|
|
Jun. 30, 2013
|
Dec. 31, 2014
|
Dec. 31, 2013
|
Dec. 31, 2012
|
Jun. 30, 2013
|
| Operating Loss Carryforwards [Line Items] |
|
|
|
|
|
| Effective income tax rate |
|
4.50% |
|
|
|
| Company's pretax income |
|
$ 3,915,000 |
$ 699,000 |
$ 6,030,000 |
|
| Federal tax rate |
|
34.00% |
|
|
|
| Anticipated future tax rate |
|
35.00% |
|
|
|
| Nondeductible merger related costs |
|
974,000 |
0 |
0 |
|
| Income tax expense (benefit) |
|
178,000 |
(50,146,000) |
79,000 |
|
| Reversal of valuation allowance |
41,600,000 |
0 |
(41,632,000) |
0 |
|
| Previously written off section 382 deferred tax benefits |
8,500,000 |
|
|
|
8,500,000 |
| Deferred tax assets, operating loss carryforwards |
|
32,100,000 |
27,400,000 |
|
|
| Deferred tax assets, operating loss carryforwards state and local |
|
6,600,000 |
5,700,000 |
|
|
| Deferred tax assets, charitable contribution carryforwards |
|
800,000 |
700,000 |
|
|
| Deferred tax assets, federal tax credit carryforwards |
|
1,300,000 |
1,000,000 |
|
|
| Deferred tax assets, state tax credit carryforwards |
|
100,000 |
100,000 |
|
|
| Charitable contribution carryforward amount |
|
2,100,000 |
|
|
|
| Valuation allowance for deferred tax assets |
|
(78,000) |
(74,000) |
(41,700,000) |
|
| Proceeds from Issuance of Common Stock |
|
177,000,000 |
|
|
|
| Domestic Tax Authority [Member] |
|
|
|
|
|
| Operating Loss Carryforwards [Line Items] |
|
|
|
|
|
| Operating loss carryforwards |
|
91,700,000 |
|
|
|
| Tax credit carryforward |
|
1,300,000 |
|
|
|
| State and Local Jurisdiction [Member] |
|
|
|
|
|
| Operating Loss Carryforwards [Line Items] |
|
|
|
|
|
| Operating loss carryforwards |
|
147,000,000 |
|
|
|
| Tax credit carryforward |
|
$ 200,000 |
|
|
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