Basis of Presentation and Significant Accounting Policies - (Details Textual) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013 Customers Service_Center	Dec. 31, 2012	Dec. 31, 2011
Accounting Policies [Line Items]
Undistributed Earnings of Foreign Subsidiaries	$ 83,086
Service centers	46
Joint venture ownership percentage	50.00%
maximum maturity of investments to be considered cash equivalent	90 days
Shipping, Handling and Transportation Costs	35,171	36,585	35,214
Percentage of LIFO inventory	80.00%
Amount current replacement cost of inventory costs exceeds book value	130,854	139,940
Effect of LIFO Inventory Liquidation on Income	$ (1,834)
Percentage tax benefit recognized on dividends declared, joint venture subsidiaries	80.00%
Outstanding common stock equivalents	0	0	0
Number of customers, annual sales in excess of 3% of total annual sales	0
Number of trading days preceeding grant date from which closing stock price used to determine exercise price, 2010 grants, alternate valuation method	10 days
Weighted average forfeiture rate	38.00%
Measurement period for targeted goals under the long-term compensation plan	3 years
Geographic Concentration Risk
Accounting Policies [Line Items]
Percentage concentration of U.S. sales	78.00%
Point where convertible notes become dilutive
Accounting Policies [Line Items]
Stock conversion price, per share, convertible notes	$ 10.28
Dillutive effect if convertible notes become dillutive | Convertible Debt Securities
Accounting Policies [Line Items]
Outstanding common stock equivalents	5,600
Non-compete agreements
Accounting Policies [Line Items]
Intangible assets useful lives	3 years
Developed technology
Accounting Policies [Line Items]
Intangible assets useful lives	3 years
Minimum | Stock Options
Accounting Policies [Line Items]
Contractual period for options granted	8 years
Minimum | Customer relationships
Accounting Policies [Line Items]
Intangible assets useful lives	4 years
Minimum | Trade name
Accounting Policies [Line Items]
Intangible assets useful lives	1 year
Maximum
Accounting Policies [Line Items]
Sales Revenue Not Recognized at Shipment, As a Percentage of Total Sales	3.00%	3.00%	3.00%
Maximum | Stock Option
Accounting Policies [Line Items]
Contractual period for options granted	10 years
Maximum | Customer relationships
Accounting Policies [Line Items]
Intangible assets useful lives	12 years
Maximum | Trade name
Accounting Policies [Line Items]
Intangible assets useful lives	10 years
North America
Accounting Policies [Line Items]
Service centers	42
Europe
Accounting Policies [Line Items]
Service centers	3
Asia
Accounting Policies [Line Items]
Service centers	1
Executives and Employees | Minimum | Stock Options and Restricted Stock
Accounting Policies [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	1 year
Executives and Employees | Maximum | Stock Options and Restricted Stock
Accounting Policies [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	5 years
Director | Stock Options and Restricted Stock
Accounting Policies [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	3 years