Summary of Significant Accounting Policies - Effect of Topic 842 (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Jan. 01, 2019	Dec. 31, 2018
Current assets:
Prepaid expenses and other current assets	$ 5,406	$ 4,339	$ 6,989
Total currents assets	130,594	191,331	193,981
Other long-term assets	14,433	21,121	4,198
Total assets	1,137,955	1,268,661	1,254,388
Current liabilities:
Other current liabilities	24,043	27,528	24,066
Total current liabilities	75,531	126,097	122,635
Long-term liabilities:
Other long-term liabilities	10,474	13,749	2,938
Total long-term liabilities	642,880	642,738	631,927
Equity:
Total liabilities and partners’ capital	$ 1,137,955	1,268,661	$ 1,254,388
Effect of Adoption of Topic 842 - Leases
Current assets:
Prepaid expenses and other current assets		(2,650)
Total currents assets		(2,650)
Other long-term assets		16,923
Total assets		14,273
Current liabilities:
Other current liabilities		3,462
Total current liabilities		3,462
Long-term liabilities:
Other long-term liabilities		10,811
Total long-term liabilities		10,811
Equity:
Total liabilities and partners’ capital		$ 14,273