Income Taxes-Reconciliation to federal statutory rate (Details) - USD ($) $ in Thousands |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2015 |
Dec. 31, 2014 |
Dec. 31, 2013 |
|
| Income tax provision reconciliation to federal statutory rate | |||
| Federal statutory income tax rate | 35.00% | ||
| Federal income taxes at statutory rate | $ (11,121) | $ 20,961 | $ 28,385 |
| State income taxes, net of federal benefit | 1,872 | 1,975 | 988 |
| Goodwill impairment | 15,824 | 0 | 0 |
| Foreign taxes | 3,804 | 1,544 | (778) |
| Change in valuation allowance | 3,643 | 3,023 | 2,479 |
| Research and development credits | (1,912) | (266) | (1,909) |
| Foreign tax credits | (651) | (1,043) | (3,542) |
| Nondeductible meals and entertainment | 1,441 | 1,662 | 1,102 |
| Tax rate changes | 412 | 1,002 | 1,749 |
| Other | 520 | (78) | 1,292 |
| Provision for income taxes | 13,832 | $ 28,780 | $ 29,766 |
| Undistributed earnings of foreign subsidiaries | $ 139,396 | ||