Acquisitions (MSB) (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Mar. 31, 2014	Sep. 30, 2015
Business Acquisition [Line Items]
Goodwill, Acquired During Period		$ 64,565
MSB/DQ Member [Domain]
Business Acquisition [Line Items]
Goodwill, Acquired During Period	$ 307,773
Data and Analytics [Member]
Business Acquisition [Line Items]
Goodwill, Acquired During Period		64,565
Data and Analytics [Member] | MSB/DQ Member [Domain]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents	36
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables	9,227
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Prepaid Expense and Other Assets	2,190
Business Combination, Recognized Intangible Assets Acquired, Deferred Tax Asset Current	6,658
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment	177,311
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles	129,400
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Assets Noncurrent	29,760
Business Combination, Recognized Intangible Assets Acquired, equity method investment	18,300
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets	680,655
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Accounts Payable	3,911
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Income Tax Payable	31
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Deferred Revenue	$ 22,371
business acquisition, recognized identifiable assets acquired, deferred revenue non current	1,823
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net	$ 652,519
Business Acquisition, Goodwill, Expected Tax Deductible Amount		$ 167,800