Supplementary Balance Sheet Information - Significant Components of Contract Acquisition Costs (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Acquired Finite-Lived Intangible Assets [Line Items]
Finite lived intangible assets	$ 243,794	$ 247,811
Conversion costs
Acquired Finite-Lived Intangible Assets [Line Items]
Finite lived intangible assets	149,396	159,000
Payments for processing rights
Acquired Finite-Lived Intangible Assets [Line Items]
Finite lived intangible assets	$ 94,398	$ 88,811