Long-Term Obligations - Summary of Leverage Ratio (Details) - Credit Agreement	12 Months Ended
	Dec. 31, 2016
Tier One
Schedule Of Percentage Margin For Eurodollar Rate Loans And Commitment Fee [Line Items]
Consolidated Leverage Ratio	0.02
Applicable Margin for Base Rate Loans	1.00%
Commitment Fee	0.40%
Tier One | Minimum
Schedule Of Percentage Margin For Eurodollar Rate Loans And Commitment Fee [Line Items]
Consolidated Leverage Ratio	3.5
Tier Two
Schedule Of Percentage Margin For Eurodollar Rate Loans And Commitment Fee [Line Items]
Consolidated Leverage Ratio	0.0175
Applicable Margin for Base Rate Loans	0.75%
Commitment Fee	0.35%
Tier Two | Maximum
Schedule Of Percentage Margin For Eurodollar Rate Loans And Commitment Fee [Line Items]
Consolidated Leverage Ratio	3.5
Tier Two | Minimum
Schedule Of Percentage Margin For Eurodollar Rate Loans And Commitment Fee [Line Items]
Consolidated Leverage Ratio	2.75
Tier Three
Schedule Of Percentage Margin For Eurodollar Rate Loans And Commitment Fee [Line Items]
Consolidated Leverage Ratio	0.015
Applicable Margin for Base Rate Loans	0.50%
Commitment Fee	0.30%
Tier Three | Maximum
Schedule Of Percentage Margin For Eurodollar Rate Loans And Commitment Fee [Line Items]
Consolidated Leverage Ratio	2.75
Tier Three | Minimum
Schedule Of Percentage Margin For Eurodollar Rate Loans And Commitment Fee [Line Items]
Consolidated Leverage Ratio	1.75
Tier Four
Schedule Of Percentage Margin For Eurodollar Rate Loans And Commitment Fee [Line Items]
Consolidated Leverage Ratio	0.0125
Applicable Margin for Base Rate Loans	0.25%
Commitment Fee	0.25%
Tier Four | Maximum
Schedule Of Percentage Margin For Eurodollar Rate Loans And Commitment Fee [Line Items]
Consolidated Leverage Ratio	1.75
Tier Four | Minimum
Schedule Of Percentage Margin For Eurodollar Rate Loans And Commitment Fee [Line Items]
Consolidated Leverage Ratio	1
Tier Five
Schedule Of Percentage Margin For Eurodollar Rate Loans And Commitment Fee [Line Items]
Consolidated Leverage Ratio	0.01
Applicable Margin for Base Rate Loans	0.00%
Commitment Fee	0.25%
Tier Five | Maximum
Schedule Of Percentage Margin For Eurodollar Rate Loans And Commitment Fee [Line Items]
Consolidated Leverage Ratio	1.00