Fair Value Measurement - Fair Value on a Recurring Measurements (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Assets:
Cash equivalents	$ 5,412	$ 80,944
Derivative asset	632	615
Total assets measured at fair value on a recurring basis	6,044	81,559
Temporary equity - Redeemable non-controlling interests		99,000
Level 1 [Member]
Assets:
Cash equivalents	5,412	80,944
Total assets measured at fair value on a recurring basis	5,412	80,944
Level 2 [Member]
Assets:
Derivative asset	632	615
Total assets measured at fair value on a recurring basis	$ 632	615
Level 3 [Member]
Assets:
Temporary equity - Redeemable non-controlling interests		$ 99,000