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Fair Value Measurements (Balance Measured at Fair Value) (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Assets
Restricted cash	$ 22,047	$ 16,488
Investment available for sale	17,525	16,820
Fair Value, Measurements, Recurring [Member]
Assets
Cash and cash equivalents	167,007	193,862
Restricted cash	22,047	16,488
Investment available for sale	17,865	17,259	$ 20,960
Liabilities
Business Combination, Contingent Consideration, Liability	3,348	3,038
Fair Value, Measurements, Recurring [Member] | Level 1
Assets
Cash and cash equivalents	167,007	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	17,865	17,259
Liabilities
Business Combination, Contingent Consideration, Liability	$ 3,348	$ 3,038

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