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Fair Value Measurements (Balance Measured at Fair Value) (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016	Dec. 31, 2015
Assets
Restricted cash	$ 21,640	$ 16,488
Investment available for sale	17,000	16,800
Liabilities
Fair Value, Discount Amount, Available for sales securities	3,000	3,100
Fair Value, Measurements, Recurring [Member]
Assets
Cash and cash equivalents	162,963	193,862
Restricted cash	21,640	16,488
Investment available for sale	17,456	17,259	$ 20,500
Liabilities
Business Combination, Contingent Consideration, Liability	3,204	3,038
Fair Value, Measurements, Recurring [Member] | Level 1
Assets
Cash and cash equivalents	162,963	193,862
Investment available for sale	0	0
Liabilities
Business Combination, Contingent Consideration, Liability	0	0
Fair Value, Measurements, Recurring [Member] | Level 2
Assets
Cash and cash equivalents	0	0
Restricted cash	0	0
Investment available for sale	0	0
Liabilities
Business Combination, Contingent Consideration, Liability	0	0
Fair Value, Measurements, Recurring [Member] | Level 3
Assets
Cash and cash equivalents	0	0
Restricted cash	0	0
Investment available for sale	17,456	17,259
Liabilities
Business Combination, Contingent Consideration, Liability	3,204	3,038
Peninsula Gaming [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Current	$ 500	400
Liabilities
Fair Value, Discount Amount, Available for sales securities		$ 3,100

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