Fair Value Measurements - Assets And Liabilities Measured At Fair Value (Details) - Fair Value, Measurements, Recurring - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Assets:
Total assets	$ 56,514	$ 93,383
Liabilities:
Total liabilities	85,843	78,159
Quoted prices in active markets for identical assets (Level 1)
Assets:
Total assets	55,626	88,036
Significant other observable inputs (Level 2)
Assets:
Total assets	888	5,347
Liabilities:
Total liabilities	206
Significant unobservable inputs (Level 3)
Assets:
Total assets		0
Liabilities:
Total liabilities	85,637	78,159
Embedded conversion option
Liabilities:
Total liabilities	19,003	23,737
Embedded conversion option | Significant unobservable inputs (Level 3)
Liabilities:
Total liabilities	19,003	23,737
Forward contracts
Liabilities:
Total liabilities	206
Forward contracts | Significant other observable inputs (Level 2)
Liabilities:
Total liabilities	206
Contingent consideration
Liabilities:
Total liabilities	66,634	54,422
Contingent consideration | Significant unobservable inputs (Level 3)
Liabilities:
Total liabilities	66,634	54,422
Money market funds
Assets:
Total assets	34,680	84,421
Money market funds | Quoted prices in active markets for identical assets (Level 1)
Assets:
Total assets	34,680	84,421
Marketable securities
Assets:
Total assets	15,634
Marketable securities | Quoted prices in active markets for identical assets (Level 1)
Assets:
Total assets	15,634
Common stock investments, available for sale
Assets:
Total assets	5,312	3,615
Common stock investments, available for sale | Quoted prices in active markets for identical assets (Level 1)
Assets:
Total assets	5,312	3,615
Common stock options/warrants
Assets:
Total assets	888	5,338
Common stock options/warrants | Significant other observable inputs (Level 2)
Assets:
Total assets	$ 888	5,338
Forward contracts
Assets:
Total assets		9
Forward contracts | Significant other observable inputs (Level 2)
Assets:
Total assets		$ 9