Income Taxes (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Current
Federal	$ 1,362,000	$ (1,661,000)	$ 8,930,000
State	683,000	1,294,000	1,096,000
Foreign	9,396,000	6,875,000	4,993,000
Total current	11,441,000	6,508,000	15,019,000
Deferred
Federal	(361,000)	(7,053,000)	(41,513,000)
State	(495,000)	(2,258,000)	(3,922,000)
Foreign	(1,156,000)	3,554,000	(52,000)
Total deferred	(2,012,000)	(5,757,000)	(45,487,000)
Total tax provision (benefit)	9,429,000	751,000	(30,468,000)
Effective Income Tax Rate Reconciliation Detail [Table]
Income tax provision (benefit) computed at statutory federal income tax rates	9,864,000	2,182,000	(25,827,000)
State income taxes (net of federal benefit)	122,000	(627,000)	(1,837,000)
Nondeductible expenses	2,340,000	1,577,000	1,654,000
Impact of international operations	(2,377,000)	(1,229,000)	(3,526,000)
Other	(520,000)	(1,152,000)	(932,000)
Total tax provision (benefit)	9,429,000	751,000	(30,468,000)
Undistributed earnings intended for investment	0
Domestic and Foreign Income Before Tax Detail [Table]
Domestic	2,206,000	(9,167,000)	(92,557,000)
International	25,977,000	15,400,000	18,764,000
Total	28,183,000	6,233,000	(73,793,000)
Unrecognized Tax Benefit Liability Rollforward Detail [Table]
Gross unrecognized tax benefits at beginning of period	1,552,000	1,849,000	2,256,000
Additions related to acquisitions	742,000	0	0
Increases in tax positions for prior years	0	0	0
Decreases in tax positions for prior years	0	0	0
Increases in tax positions for current year	313,000	0	0
Settlements	0	0	0
Lapse in statute of limitations	(280,000)	(297,000)	(407,000)
Gross unrecognized tax benefits at end of period	2,327,000	1,552,000	1,849,000
Net reversal of previously recorded interest and penalties		300,000	200,000
Accrued potential interest and penalties		1,500,000
Amount of unrecognized tax benefits that would affect effective tax rate		1,100,000
Deferred tax assets:
Net operating losses	20,888,000	5,570,000
Foreign tax credits and alternative minimum tax credits	6,976,000	5,003,000
Accruals	46,259,000	53,584,000
Goodwill	0	1,975,000
All other	2,130,000	17,489,000
Total deferred tax assets	76,253,000	83,621,000
Deferred tax liabilities:
Excess book over tax basis in property, plant, and equipment	78,614,000	81,501,000
All other	7,506,000	6,225,000
Total deferred tax liability	86,120,000	87,726,000
Net deferred tax liability	13,915,000	8,874,000
Foreign tax credits	$ 6,300,000