function withdrawRewardFor(address _account) noEther internal returns (bool _success) {
        if ((balanceOf(_account) * rewardAccount.accumulatedInput()) / totalSupply < paidOut[_account])
            throw;

        uint reward =
            (balanceOf(_account) * rewardAccount.accumulatedInput()) / totalSupply - paidOut[_account];

        reward = rewardAccount.balance < reward ? rewardAccount.balance : reward;

        paidOut[_account] += reward;
        if (!rewardAccount.payOut(_account, reward))
            throw;

        return true;
    }