Derivative Financial Instruments Derivative Financial Instruments (Tables)

12 Months Ended

Dec. 31, 2017

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block]

The fair values of our derivative instruments are as follows:

		Fair Value
	Balance Sheet Location	December 31, 2017		December 31, 2016
		(in thousands)
Asset Derivatives
Derivatives designated as hedging instruments under ASC 815-20
Interest rate swap contracts	Other current assets	$	658	$	—
Interest rate cap contracts	Other current assets	17		3
Interest rate swap contracts	Other long-term assets	1,712		1,830
Interest rate cap contracts	Other long-term assets	179		376
Derivatives not designated as hedging instruments under ASC 815-20
Foreign exchange forward contracts	Other current assets	41		169
Interest rate cap contracts	Other current assets	25		4
Interest rate cap contracts	Other long-term assets	268		563
Total asset derivatives		$	2,900	$	2,945
Liability Derivatives
Derivatives designated as hedging instruments under ASC 815-20
Interest rate swap contracts	Other current liabilities	$	—	$	934
Derivatives not designated as hedging instruments under ASC 815-20
Foreign exchange forward contracts	Other current liabilities	289		449
Total liability derivatives		$	289	$	1,383

Accumulated OCI for Derivative and Nonderivative Instruments Designated as Hedging Instruments, Net of Tax [Table Text Block]

OCI during the reporting period for our derivative and nonderivative instruments designated as hedging instruments, net of tax, was as follows:

	2017			2016			2015
	(in thousands)
Net unrealized gain (loss) on hedging instruments at January 1,	$	(14,337	)	$	(14,062	)	$	(15,148	)
Unrealized gain (loss) on derivative instruments	360			(1,087		)	76
Realized (gains) losses reclassified into net income (loss)	563			812			1,010
Net unrealized gain (loss) on hedging instruments at December 31,	$	(13,414	)	$	(14,337	)	$	(14,062	)

Offsetting Assets [Table Text Block]

A summary of the potential effect of netting arrangements on our financial position related to the offsetting of our recognized derivative assets and liabilities under master netting arrangements or similar agreements is as follows:

Offsetting of Derivative Assets
			Gross Amounts Not Offset in the Consolidated Balance Sheets
	Gross Amounts of Recognized Assets Presented in the Consolidated Balance Sheets		Derivative Financial Instruments			Cash Collateral Received		Net Amount
	(in thousands)
December 31, 2017	$	2,900	$	(90	)	$	—	$	2,810
December 31, 2016	$	2,945	$	(1,322	)	$	—	$	1,623

Offsetting Liabilities [Table Text Block]

Offsetting of Derivative Liabilities
			Gross Amounts Not Offset in the Consolidated Balance Sheets
	Gross Amounts of Recognized Liabilities Presented in the Consolidated Balance Sheets		Derivative Financial Instruments			Cash Collateral Pledged		Net Amount
	(in thousands)
December 31, 2017	$	289	$	(90	)	$	—	$	199
December 31, 2016	$	1,383	$	(1,322	)	$	—	$	61

Derivative Instruments, Gain (Loss) [Table Text Block]

:

Derivatives in ASC 815-20 Cash Flow Hedging Relationships	Amount of Gain (Loss) Recognized in OCI on Derivative (Effective Portion)									Loss Reclassified from AOCI into Income (Effective Portion)										Loss Recognized in Income on Derivative (Ineffective Portion)
										Location	Amount									Location	Amount
	2017			2016			2015				2017			2016			2015				2017		2016			2015
	(in thousands)										(in thousands)										(in thousands)
Interest rate swap contracts	$	768		$	(1,163	)	$	367		Interest expense	$	(706	)	$	(1,296	)	$	(1,639	)	Interest expense	$	—	$	—		$	—
Interest rate cap contracts	$	(183	)	$	(605	)	$	(244	)	Interest expense	$	(210	)	$	(27	)	$	—		Interest expense	$	—	$	(1	)	$	—

Foreign Exchange Derivatives Not Designated As Hedging Instruments [Table Text Block]

:

Derivatives Not Designated as Hedging Instrument under ASC 815-20	Location	Gain (Loss) Recognized in Income on Derivative
		2017			2016		2015
		(in thousands)
Foreign exchange forward contracts	Other income (expense), net	$	(6,281	)	$	537	$	(3,145	)
Interest rate cap contracts	Interest expense	$	(274	)	$	129	$	—