Equity - VIEs (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 93,035	$ 71,684
Accounts receivable	45,406	70,350
Other current assets	14,597	11,818
Total current assets	216,491	204,874
Goodwill	120,343	120,343
Other assets	3,117	4,139
Total assets	369,154	366,667
Current liabilities:
Accounts payable and accrued liabilities	26,258	27,322
Other current liabilities	1,227	1,295
Total current liabilities	69,770	90,661
Long-term liabilities:
Long-term portion of Senior Credit Facility	135,000	100,000
Subordinated debt	10,000	0
Other long-term liabilities	0	30
Total liabilities	214,770	190,918
Variable Interest Entity, Primary Beneficiary
Current assets:
Cash and cash equivalents	92,669	71,442
Accounts receivable	45,406	70,350
Other current assets	70,736	55,575
Total current assets	208,811	197,367
Goodwill	120,343	120,343
Other assets	11,148	15,259
Total non-current assets	131,491	135,602
Total assets	340,302	332,969
Current liabilities:
Accounts payable and accrued liabilities	55,373	61,436
Other current liabilities	38,425	43,676
Total current liabilities	93,798	105,112
Long-term liabilities:
Long-term portion of Senior Credit Facility	135,000	100,000
Subordinated debt	10,000	0
Other long-term liabilities	0	256
Total long-term liabilities	145,000	100,256
Total liabilities	$ 238,798	$ 205,368