Annual report pursuant to Section 13 and 15(d)

Income Taxes - Income Tax Reconciliation (Details)

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Income Taxes - Income Tax Reconciliation (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Income Tax Disclosure [Abstract]    
Income tax at federal statutory rate $ 16,250 $ 7,016
Effect of permanent differences 370 9
Change in valuation allowance 2,017 (2,070)
Foreign rate differential (18,099) (5,240)
Change in enacted tax rates 5 38
Expiration of net operating loss carryforward 0 519
Other reconciling items 9 (6)
Income tax provision $ 552 $ 266