Income Taxes (Tables)

12 Months Ended

Dec. 31, 2014

Income Tax Disclosure [Abstract]

Schedule of Income before Income Tax, Domestic and Foreign [Table Text Block]

Year Ended December 31,	2014		2013		2012
(Thousands of dollars)
Income before income taxes and equity earnings:
Domestic	$	8,328	$	27,981	$	26,661
International	7,374		8,860		7,828
	$	15,702	$	36,841	$	34,489

Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]

The (provision) benefit for income taxes is comprised of the following:

Year Ended December 31,	2014			2013			2012
(Thousands of dollars)
Current taxes
Federal	$	(2,976	)	$	(9,951	)	$	(7,629	)
State	(453		)	(859		)	(554		)
Foreign (1)	(8,660		)	(1,307		)	18,211
Total current taxes	(12,089		)	(12,117		)	10,028
Deferred taxes
Federal	657			183			(10,589		)
State	(109		)	277			(4,023		)
Foreign	4,642			(2,360		)	986
Total deferred taxes	5,190			(1,900		)	(13,626		)
Income tax (provision) benefit	$	(6,899	)	$	(14,017	)	$	(3,598	)

Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]

reconciliation of the United States federal tax rate to our effective income tax rate:

Year Ended December 31,	2014		2013		2012
Statutory rate	(35.0	)%	(35.0	)%	(35.0	)%
State tax provisions, net of federal income tax benefit	(0.5	)	(1.0	)	(0.6	)
Permanent differences	(5.3	)	(0.1	)	5.3
Tax credits	2.8		6.0		3.3
Foreign income taxed at rates other than the statutory rate	(0.5	)	0.7		0.5
Valuation allowance and other	(8.4	)	—		(9.8	)
Changes in tax liabilities, net	4.2		(5.7	)	22.0
Other	(1.2	)	(2.9	)	3.9
Effective income tax rate	(43.9	)%	(38.0	)%	(10.4	)%

Schedule of Deferred Tax Assets and Liabilities [Table Text Block]

Tax effects of temporary differences that gave rise to significant portions of the deferred tax assets and deferred liabilities at December 31, 2014 and 2013, are as follows:

December 31,	2014			2013
(Thousands of dollars)
Deferred income tax assets:
Liabilities deductible in the future	$	10,424		$	8,164
Deferred compensation	14,023			13,026
Net loss carryforward	2,377			2,359
Tax credit carryforward	1,018			1,040
Competent authority deferred tax assets and other foreign timing differences	8,603			6,426
Other	1,430			1,091
Total before valuation allowances	37,875			32,106
Valuation allowances	(3,911		)	(3,398		)
Net deferred income tax assets	33,964			28,708
Deferred income tax liabilities:
Differences between the book and tax basis of property, plant and equipment	(21,337		)	(27,197		)
Deferred income tax liabilities	(21,337		)	(27,197		)
Net deferred income tax assets	$	12,627		$	1,511

Schedule of Unrecognized Tax Benefits Roll Forward [Table Text Block]

We account for our uncertain tax positions in accordance with U.S. GAAP. A reconciliation of the beginning and ending amounts of these tax benefits for the three years ended December 31, 2014 is as follows:

Year Ended December 31,	2014			2013			2012
(Thousands of dollars)
Beginning balance	$	9,462		$	6,310		$	12,637
Increases (decreases) due to foreign currency translations	(244		)	—			632
Increases (decreases)  as a result of positions taken during:
Prior periods	(2,553		)	(197		)	(6,362		)
Current period	956			3,655			2,700
Settlements with taxing authorities	—			(306		)	(870		)
Expiration of applicable statutes of limitation	(428		)	—			(2,427		)
Ending balance (1)	$	7,193		$	9,462		$	6,310