Income Taxes (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Current
Federal	$ 530,000	$ 1,362,000	$ (1,661,000)
State	(225,000)	683,000	1,294,000
Foreign	6,065,000	9,396,000	6,875,000
Total current	6,370,000	11,441,000	6,508,000
Deferred
Federal	(6,685,000)	(361,000)	(7,053,000)
State	(1,121,000)	(495,000)	(2,258,000)
Foreign	(2,018,000)	(1,156,000)	3,554,000
Total deferred	(9,824,000)	(2,012,000)	(5,757,000)
Total tax provision (benefit)	(3,454,000)	9,429,000	751,000
Effective Income Tax Rate Reconciliation Detail [Table]
Income tax provision (benefit) computed at statutory federal income tax rates	(45,000)	9,864,000	2,182,000
State income taxes (net of federal benefit)	(875,000)	122,000	(627,000)
Nondeductible expenses	1,382,000	1,460,000	1,046,000
Impact of international operations	(3,538,000)	(2,377,000)	(1,229,000)
Other	(378,000)	360,000	(621,000)
Total tax provision (benefit)	(3,454,000)	9,429,000	751,000
Undistributed earnings intended for investment	48,900,000
Domestic and Foreign Income Before Tax Detail [Table]
Domestic	(14,322,000)	2,206,000	(9,167,000)
International	14,194,000	25,977,000	15,400,000
Total	(128,000)	28,183,000	6,233,000
Unrecognized Tax Benefit Liability Rollforward Detail [Table]
Gross unrecognized tax benefits at beginning of period	2,327,000	1,552,000	1,849,000
Additions related to acquisitions	0	742,000	0
Increases in tax positions for prior years	0	0	0
Decreases in tax positions for prior years	(118,000)	0	0
Increases in tax positions for current year	202,000	313,000	0
Settlements	0	0	0
Lapse in statute of limitations	(393,000)	(280,000)	(297,000)
Gross unrecognized tax benefits at end of period	2,018,000	2,327,000	1,552,000
Recognized interest and penalties	(200,000)	300,000	300,000
Accrued potential interest and penalties	2,100,000	2,300,000
Amount of unrecognized tax benefits that would affect effective tax rate	2,100,000	2,600,000
Deferred tax assets:
Net operating losses	51,130,000	20,888,000
Foreign tax credits and alternative minimum tax credits	10,233,000	6,976,000
Accruals	30,057,000	46,259,000
All other	2,856,000	2,130,000
Total deferred tax assets	94,276,000	76,253,000
Valuation allowance	(3,747,000)	(4,048,000)
Net deferred tax assets	90,529,000	72,205,000
Deferred tax liabilities:
Excess book over tax basis in property, plant, and equipment	85,035,000	78,614,000
All other	8,414,000	7,506,000
Total deferred tax liability	93,449,000	86,120,000
Net deferred tax liability	2,920,000	13,915,000
Foreign and state net operating loss carryforwards	242,300,000
Foreign tax credits	$ 9,400,000