Comprehensive Income (Loss) (Tables)

12 Months Ended

Dec. 31, 2018

Statement of Comprehensive Income [Abstract]

Schedule of Comprehensive Income (Loss)

The following tables display the components of Other Comprehensive Income (Loss), after-tax, and the related tax effects (in thousands):

	December 31,
	2018							2017									2016
	Before-Tax Amount		Tax Expense			Net-of-Tax Amount		Before-Tax Amount			Tax Benefit (Expense)			Net-of-Tax Amount			Before-Tax Amount			Tax Benefit (Expense)			Net-of-Tax Amount
Foreign currency translation adjustment	$	270	$	—		$	270	$	(202	)	—			$	(202	)	$	25		$	—		$	25
Reclassification of net losses (gains) on derivative instruments	614		(116		)	498		613			(242		)	371			(2,169		)	831			(1,338		)
Postretirement medical liability adjustment	346		(133		)	213		1,257			(484		)	773			317			(122		)	195
Other comprehensive income (loss)	$	1,230	$	(249	)	$	981	$	1,668		$	(726	)	$	942		$	(1,827	)	$	709		$	(1,118	)

Accumulated Other Comprehensive Income [Table Text Block]

Balances by classification included within AOCL on the Consolidated Balance Sheets are as follows, net of tax (in thousands):

	December 31,
	2018			2017
Foreign currency translation	$	1,448		$	1,178
Derivative instruments designated as cash flow hedges	(11,633		)	(9,981		)
Postretirement medical plans	251			31
Accumulated other comprehensive loss	$	(9,934	)	$	(8,772	)

Schedule of Accumulated Comprehensive Income (Loss)

The following table displays the changes in AOCL by component, net of tax (in thousands):

		December 31, 2018
		Year Ended
	Affected Line Item in the Consolidated Statements of Income	Interest Rate Derivative Instruments Designated as Cash Flow Hedges			Postretirement Medical Plans		Foreign Currency Translation		Total
Beginning balance		$	(9,981	)	$	31	$	1,178	$	(8,772	)
Other comprehensive income before reclassifications		—			—		270		270
Amounts reclassified from AOCL	Interest Expense	498			—		—		498
Amounts reclassified from AOCL		—			213		—		213
Net current-period other comprehensive income (loss)		498			213		270		981
Reclassification of certain tax effects from AOCL		(2,150		)	7		—		(2,143		)
Ending Balance		$	(11,633	)	$	251	$	1,448	$	(9,934	)

		December 31, 2017
		Year Ended
	Affected Line Item in the Consolidated Statements of Income	Interest Rate Derivative Instruments Designated as Cash Flow Hedges			Postretirement Medical Plans			Foreign Currency Translation			Total
Beginning balance		$	(10,352	)	$	(742	)	$	1,380		$	(9,714	)
Other comprehensive income before reclassifications		—			—			(202		)	(202		)
Amounts reclassified from AOCL	Interest Expense	371			—			—			371
Amounts reclassified from AOCL		—			773			—			773
Net current-period other comprehensive (loss) income		371			773			(202		)	942
Ending Balance		$	(9,981	)	$	31		$	1,178		$	(8,772	)