Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Cash flows from operating activities:
Net income	$ 7,275us-gaap_NetIncomeLoss	$ 9,954us-gaap_NetIncomeLoss
Adjustments to reconcile net income attributable to net cash provided by (used for) operating activities:
Depreciation and amortization	3,752	3,462
Pension expense	913us-gaap_PensionExpense	696us-gaap_PensionExpense
Contributions to pension plan		(1,200)us-gaap_PensionContributions
Changes in operating assets and liabilities:
Accounts receivable - net	(860)us-gaap_IncreaseDecreaseInReceivables	(12,528)us-gaap_IncreaseDecreaseInReceivables
Inventories - net	(2,442)us-gaap_IncreaseDecreaseInInventories	1,014us-gaap_IncreaseDecreaseInInventories
Accounts payable	2,453	(920)
Commissions payable	1,024	103
Deferred revenue	(777)	(599)
Accrued expenses	(322)	169
Benefit obligations and other	(2,053)	(1,514)
Net cash provided by (used for) by operating activities	8,963	(1,363)
Cash flows used in investing activities, Capital additions - net:	(1,397)	(1,591)
Cash flows used in financing activities:
Cash dividends	(2,626)us-gaap_DividendsCash	(2,692)us-gaap_DividendsCash
Payments to bank for borrowings	(3,000)us-gaap_ProceedsFromBankDebt	(3,837)us-gaap_ProceedsFromBankDebt
Net cash used in financing activities	(5,626)	(6,529)
Effect of exchange rate changes on cash	870	110
Net increase (decrease) in cash and cash equivalents	2,810	(9,373)
Beginning of period	24,491	31,123
End of period	$ 27,301	$ 21,750

Name:	us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.