Restatement and Revision of Previously Issued Consolidated Financial Statements - Consolidated Statements of Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended								6 Months Ended		9 Months Ended		12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net income (loss)	$ (7,304)	$ (2,200)	$ (618)	$ (3,385)	$ 13,861	$ 7,141	$ (1,121)	$ (2,183)	$ (4,003)	$ (3,304)	$ (6,203)	$ 3,837	$ (13,507)	$ 17,698	$ 15,884
Foreign currency translation adjustment	201	(18)	113	214	(1,135)	902	(412)	573	327	161	309	1,063	510	(73)	648
Loss on long-term intra-entity foreign currency transactions	294	(509)	121	15	60	(53)	(1,013)	0	136	(1,013)	(373)	(1,066)	(79)	(1,006)	0
Cash flow hedging activity	(143)	(127)	(877)	(422)	(352)	(301)	464	289	(1,299)	753	(1,426)	452	(1,569)	100	(749)
Reclassification of hedging activities into earnings	81	122	144	2	48	(102)	41	166	146	207	268	105	349	153	641
Pension plan adjustment	1,410	0	0	0	(1,920)	0	0	0	0	0	0	0	1,410	(1,920)	1,510
Reclassification of pension adjustments into earnings	35	127	102	84	141	115	142	158	186	300	313	415	348	556	306
Total other comprehensive income (loss), net of tax	1,878	(405)	(397)	(107)	(3,158)	561	(778)	1,186	(504)	408	(909)	969	969	(2,190)	2,356
Comprehensive income (loss)	(5,426)	(2,605)	(1,015)	(3,492)	10,703	7,702	(1,899)	(997)	(4,507)	(2,896)	(7,112)	4,805	(12,538)	15,508	18,240
As Previously Reported
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net income (loss)	(1,214)	397	(944)	(1,761)	15,032	8,044	(874)	(418)	(2,705)	(1,292)	(2,308)	6,752	(3,522)	21,784	17,905
Foreign currency translation adjustment	857	(312)	226	330	(1,441)	1,257	(892)	917	556	25	244	1,282	1,101	(159)	689
Loss on long-term intra-entity foreign currency transactions	294	(509)	121	15	60	(53)	(1,013)	0	136	(1,013)	(373)	(1,066)	(79)	(1,006)	0
Cash flow hedging activity	(143)	(127)	(877)	(566)	(208)	(301)	464	289	(1,443)	753	(1,570)	452	(1,713)	244	(749)
Reclassification of hedging activities into earnings	81	122	144	2	48	(102)	41	166	146	207	268	105	349	153	641
Pension plan adjustment	1,410	0	0	0	(1,920)	0	0	0	0	0	0	0	1,410	(1,920)	1,510
Reclassification of pension adjustments into earnings	35	127	102	(10)	235	115	142	158	92	300	219	415	254	650	306
Total other comprehensive income (loss), net of tax	2,534	(699)	(284)	(229)	(3,226)	916	(1,258)	1,530	(513)	272	(1,212)	1,188	1,322	(2,038)	2,397
Comprehensive income (loss)	1,320	(302)	(1,228)	(1,990)	11,806	8,960	(2,132)	1,112	(3,218)	(1,020)	(3,520)	7,940	(2,200)	19,746	20,302
Restatement Impacts
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net income (loss)	(6,090)	(2,597)	326	(1,624)	(1,171)	(903)	(247)	(1,765)	(1,298)	(2,012)	(3,895)	(2,915)	(9,985)	(4,086)	(2,021)
Foreign currency translation adjustment	(656)	294	(113)	(116)	306	(355)	480	(344)	(229)	136	65	(219)	(591)	86	(41)
Loss on long-term intra-entity foreign currency transactions	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0
Cash flow hedging activity	0	0	0	144	(144)	0	0	0	144	0	144	0	144	(144)	0
Reclassification of hedging activities into earnings	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0
Pension plan adjustment	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0
Reclassification of pension adjustments into earnings	0	0	0	94	(94)	0	0	0	94	0	94	0	94	(94)	0
Total other comprehensive income (loss), net of tax	(656)	294	(113)	122	68	(355)	480	(344)	9	136	303	(219)	(353)	(152)	(41)
Comprehensive income (loss)	$ (6,746)	$ (2,303)	$ 213	$ (1,502)	$ (1,103)	$ (1,258)	$ 233	$ (2,109)	$ (1,289)	$ (1,876)	$ (3,592)	$ (3,135)	$ (10,338)	$ (4,238)	$ (2,062)