Intangible Assets - Future Amortization Expense (Details) $ in Thousands	Jun. 30, 2017 USD ($)
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
Estimated amortization expense 2017	$ 14,649
Estimated amortization expense 2018	14,511
Estimated amortization expense 2019	14,182
Estimated amortization expense 2020	14,127
Estimated amortization expense 2021	14,083
Estimated amortization expense thereafter	$ 64,477