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Summary of Significant Accounting Policies - Deferred Charges and Segment Information (Details)
 12 Months Ended
Dec. 31, 2016
segment
area
Segment Information:  
Number of business segments | segment 1
Number of geographic areas in which the Company operates | area 1
Minimum  
Deferred Charges:  
Deferred lease costs, amortization period (in years) 1 year
Deferred financing costs, amortization period (in years) 1 year
Maximum  
Deferred Charges:  
Deferred lease costs, amortization period (in years) 15 years
Deferred financing costs, amortization period (in years) 15 years