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Cover page. Cover [Abstract] Cash and Cash Equivalents Cash and Cash Equivalents, Fair Value Disclosure Maximum Maximum [Member] Exercisable at the end of the period (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Weighted Average Exercise Price General and administrative General and Administrative Expense [Member] Leased Office Facilities Leased Office Facilities [Member] Thereafter Lessee, Operating Lease, Liability, to be Paid, after Year Four Lessee, Operating Lease, Liability, to be Paid, after Year Four Accounting Policies [Abstract] Total intangible assets, net Finite-Lived Intangible Assets, Net Schedule of Future Minimum Payments under all Operating Leases Lessee, Operating Lease, Liability, to be Paid, Maturity [Table Text Block] Restricted Stock Restricted Stock [Member] Non-PEO NEO Average Total Compensation Amount Non-PEO NEO Average Total Compensation Amount Schedule of Share-based Compensation Arrangements by 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Restructuring Activity 2017 Amortization expense Amortization of Intangible Assets Schedule of Future Minimum Payments under Sublease Income Lessor, Operating Lease, Payment to be Received, Maturity [Table Text Block] Deferred tax asset Deferred Income Tax Assets, Net Depreciation and amortization Depreciation, Depletion and Amortization Other assets, net Other assets, net Other Assets, Noncurrent Entity Central Index Key Entity Central Index Key Other miscellaneous accrued expenses Other Accrued Expenses Current PEO Name PEO Name Schedule of Revenues from External Customers and Long-Lived Assets [Table] Schedule of Revenues from External Customers and Long-Lived Assets [Table] Accumulated other comprehensive income balances Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year Prior Year End Fair Value of 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