Income Taxes (Tables)

12 Months Ended

Dec. 31, 2017

Income Tax Disclosure [Abstract]

Income Before Income Taxes by Domestic and Foreign Locations

Income before income taxes by domestic and foreign locations consists of the following:

	December 31, 2017		December 31, 2016		December 31, 2015
Domestic	$	29,212	$	4,448	$	33,481
Foreign		41,915		29,437		17,606
Total	$	71,127	$	33,885	$	51,087

Components of Provision (Benefit) for Income Taxes

The components of the provision for income taxes consist of the following:

	December 31, 2017			December 31, 2016			December 31, 2015
Current:
Federal	$	14,836		$	3,525		$	8,866
State		106			287			467
Non-US		12,770			7,783			6,581
		27,712			11,595			15,914
Deferred:
Federal		(6,222	)		(2,177	)		572
State		371			(300	)		280
Non-US		(2,161	)		(373	)		(1,022	)
		(8,012	)		(2,850	)		(170	)
Provision for income taxes	$	19,700		$	8,745		$	15,744

Reconciliation from Tax at U.S. Federal Statutory Rate to Company's Provision (Benefit) for Income Taxes

A reconciliation from tax at the U.S. federal statutory rate to the Company’s provision for income taxes is as follows:

	December 31, 2017			December 31, 2016			December 31, 2015
Tax at US federal income tax rate	$	24,896		$	11,871		$	17,881
Deferred tax impact of U.S. tax reform		(7,819	)		—			—
State taxes, net of federal income tax effect		903			(141	)		578
Other changes in tax rate		(249	)		(102	)		32
Foreign reorganization		—			—			(710	)
Foreign taxes		(3,051	)		(2,593	)		(2,050	)
Transition tax (repatriation)		7,374			—			—
Adjustments to accrued income tax liabilities and uncertain    tax positions		(451	)		47			(18	)
Valuation allowance		(421	)		118			1,218
Tax credits and incentives		(495	)		(296	)		(420	)
Domestic manufacturing deduction		(762	)		(486	)		(1,051	)
Other		(225	)		327			284
Provision for income taxes	$	19,700		$	8,745		$	15,744

Reconciliation of Gross Amount of Unrecognized Tax Benefits Excluding Accrued Interest and Penalties

A reconciliation of the gross amount of unrecognized tax benefits excluding accrued interest and penalties is as follows:

	December 31, 2017			December 31, 2016		December 31, 2015
Balance at beginning of period	$	409		$	409	$	434
Increases related to prior year tax positions		—			—		—
Decrease related to prior year tax positions		—			—		—
Increases related to current year tax positions		—			—		—
Settlements		—			—		—
Lapse of statute of limitations		(409	)		—		(25	)
Balance at end of period	$	0		$	409	$	409

Significant Components of Deferred Tax Assets and Liabilities

	2017			2016
Deferred tax assets:
Post-retirement obligations	$	3,283		$	2,833
Tax credits		787			1,693
Expenses not currently deductible		8,461			12,987
Net operating loss carryover		3,670			5,228
Other		1,045			994
Total deferred tax assets		17,246			23,735
Valuation allowance for deferred tax assets		(3,311	)		(6,183	)
Net deferred tax assets		13,935			17,552
Deferred tax liabilities:
Property, plant and equipment		17,279			21,982
Intangible assets		38,982			39,044
Basis difference - convertible debt		—			7,670
Goodwill		7,316			7,430
Total deferred liabilities		63,577			76,126
Net deferred tax liabilities	$	49,642		$	58,574