Incentive Plan (Narrative) (Details) $ in Millions		6 Months Ended
	May 02, 2007 USD ($) shares	Jun. 30, 2016 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum number of shares granted per employee (shares)	1,500,000
Maximum amount of cash paid per employee | $	$ 10.0
2004 Incentive Award Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized and reserved for issuance under the Incentive Plan (shares)		4,474,102
Amended And Restated 2004 Incentive Award Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized and reserved for issuance under the Incentive Plan (shares)	9,474,102
Increase in number of shares reserved for issuance (shares)	5,000,000
2014 Incentive Award Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares remaining for issuance under the Incentive Plan (shares)		3,977,929
Conversion of units to shares ratio		1