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Equity - Classification of Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
 [1]
Dec. 31, 2014
Dec. 31, 2013
Variable Interest Entity [Line Items]        
Goodwill $ 79,147 [1] $ 18,379 $ 0 $ 0
Variable Interest Entity, Primary Beneficiary        
Variable Interest Entity [Line Items]        
Total Liabilities (180,670)      
Cash and Cash Equivalents | Variable Interest Entity, Primary Beneficiary        
Variable Interest Entity [Line Items]        
Total Assets 18,945      
Accounts Receivable | Variable Interest Entity, Primary Beneficiary        
Variable Interest Entity [Line Items]        
Total Assets 112,491      
Intercompany Receivable | Variable Interest Entity, Primary Beneficiary        
Variable Interest Entity [Line Items]        
Total Assets 65,866      
Other Current Assets | Variable Interest Entity, Primary Beneficiary        
Variable Interest Entity [Line Items]        
Total Assets 197,302      
Goodwill | Variable Interest Entity, Primary Beneficiary        
Variable Interest Entity [Line Items]        
Goodwill 79,147      
Deferred Tax Assets | Variable Interest Entity, Primary Beneficiary        
Variable Interest Entity [Line Items]        
Total Assets 43,991      
Other Assets | Variable Interest Entity, Primary Beneficiary        
Variable Interest Entity [Line Items]        
Total Assets 123,138      
Noncurrent Assets | Variable Interest Entity, Primary Beneficiary        
Variable Interest Entity [Line Items]        
Total Assets 320,440      
Accounts Payable | Variable Interest Entity, Primary Beneficiary        
Variable Interest Entity [Line Items]        
Total Liabilities (88,547)      
Intercompany Payable, Current | Variable Interest Entity, Primary Beneficiary        
Variable Interest Entity [Line Items]        
Total Liabilities (3,399)      
Short-term Debt | Variable Interest Entity, Primary Beneficiary        
Variable Interest Entity [Line Items]        
Total Liabilities (51,287)      
Business Combination, Contingent Consideration, Liability, Current | Variable Interest Entity, Primary Beneficiary        
Variable Interest Entity [Line Items]        
Total Liabilities (11,827)      
Convertible Subordinated Notes | Variable Interest Entity, Primary Beneficiary        
Variable Interest Entity [Line Items]        
Total Liabilities (6,582)      
Other Current Liabilities | Variable Interest Entity, Primary Beneficiary        
Variable Interest Entity [Line Items]        
Total Liabilities (9,932)      
Current Liabilities | Variable Interest Entity, Primary Beneficiary        
Variable Interest Entity [Line Items]        
Total Liabilities (164,776)      
Subordinated Debt | Variable Interest Entity, Primary Beneficiary        
Variable Interest Entity [Line Items]        
Total Liabilities (5,000)      
Business Combination, Contingent Consideration, Liability, Noncurrent | Variable Interest Entity, Primary Beneficiary        
Variable Interest Entity [Line Items]        
Total Liabilities (10,826)      
Other Noncurrent Liabilities | Variable Interest Entity, Primary Beneficiary        
Variable Interest Entity [Line Items]        
Total Liabilities (68)      
Noncurrent Liabilities | Variable Interest Entity, Primary Beneficiary        
Variable Interest Entity [Line Items]        
Total Liabilities $ (15,894)      
[1] See Note 4 "Equity" for disclosure of our variable interest entity in Spark HoldCo, LLC.