Employee Benefit Plans (Narrative) (Details) - USD ($) shares in Millions	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Jan. 31, 2015	Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for grant	6.1		6.1
Compensation cost related to restricted shares	$ 1,500,000	$ 1,300,000	$ 2,900,000	$ 2,500,000
Deferred compensation arrangement with individual, distributions paid								$ 4,500,000
Deferred compensation arrangement, vesting period						3 years	5 years
Deferred compensation arrangement, cash awards granted, amount	0		0						$ 8,900,000
Deferred compensation arrangement, compensation expense		3,700,000		5,400,000
Deferred compensation cash-based arrangement, liability	$ 1,200,000		$ 1,200,000						$ 12,800,000
Percentage of share of non-vested stock considered as call option	85.00%		85.00%
Percentage of share of non-vested stock considered as put-option			15.00%
Share-based payment award, vesting period			3 years		3 years
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated share-based compensation expense	$ 200,000	500,000		1,000,000
Share-based payment award, vesting period			3 years
E S P P [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for grant	1.0		1.0
Allocated share-based compensation expense	$ 300,000	$ 300,000	$ 600,000	$ 500,000
Shares authorized for issuance	1.5		1.5
Scenario, Adjustment [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Deferred compensation arrangement, compensation expense	$ (600,000)		$ (2,500,000)
Scenario, Adjustment [Member] | Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated share-based compensation expense			$ (900,000)