Accumulated Other Comprehensive Loss (Tables)

12 Months Ended

Dec. 31, 2017

Accumulated Other Comprehensive Income Loss [Abstract]

Summary of Activity in Accumulated Other Comprehensive Loss

	For the year ended
	December 31,
	2017			2016			2015
Unrealized loss on foreign exchange:
Balance at beginning of period	$	(25,166	)	$	(16,446	)	$	(11,973	)
Unrealized gain (loss) on foreign exchange		5,858			(8,720	)		(4,473	)
Balance at end of period	$	(19,308	)	$	(25,166	)	$	(16,446	)
Unrealized gain (loss) on derivatives:
Balance at beginning of period	$	(40	)	$	(114	)	$	(111	)
Unrealized gain (loss) on derivatives in period, net of reclassification		100			(72	)		(317	)
Reclassified to interest expense		116			244			523
Income tax expense		(46	)		(98	)		(209	)
Balance at end of period	$	130		$	(40	)	$	(114	)
	2017			2016			2015
Accumulated other comprehensive loss at December 31,		(19,178	)		(25,206	)		(16,560	)