Goodwill and Intangible Assets, Net - Estimated Future Amortization Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Goodwill and Intangible Assets, Net
Amortization expense, intangible assets	$ 4,524	$ 4,940	$ 4,835
Estimated future amortization expenses of the acquisition-related intangible assets that are considered to have a definite life
2017	4,059
2018	884
2019	884
2020	848
2021	197
Total	$ 6,872