Goodwill and Other Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2014

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Goodwill

The following table presents changes in the carrying amount of goodwill for the years ended December 31, 2014, 2013, and 2012.

Changes in the Carrying Amount of Goodwill

(Dollar amounts in thousands)

	Years Ended December 31,
	2014		2013			2012
Beginning balance	$	264,062	$	265,477		$	265,477
Acquisitions	46,527		—			—
Sale of equity method investment	—		(1,415		)	—
Ending balance	$	310,589	$	264,062		$	265,477

Schedule of Finite-Lived Intangible Assets

Other Intangible Assets

(Dollar amounts in thousands)

	Years Ended December 31,
	2014							2013							2012
	Gross		Accumulated Amortization		Net			Gross		Accumulated Amortization		Net			Gross			Accumulated Amortization			Net
Beginning balance	$	33,775	$	21,471	$	12,304		$	33,775	$	18,193	$	15,582		$	34,318		$	16,145		$	18,173
Additions	14,195		—		14,195			—		—		—			781			—			781
Amortization expense	—		2,889		(2,889		)	—		3,278		(3,278		)	—			3,372			(3,372		)
Fully amortized assets	—		—		—			—		—		—			(1,324		)	(1,324		)	—
Ending balance	$	47,970	$	24,360	$	23,610		$	33,775	$	21,471	$	12,304		$	33,775		$	18,193		$	15,582
Weighted-average remaining life (in years)					8.0							5.9									6.4
Estimated remaining useful lives (in years)					0.3 to 10.3							0.2 to 11.3									0.7 to 12.3

Schedule of Finite-Lived Intangible Assets, Future Amortization Expense

Scheduled Amortization of Other Intangible Assets

(Dollar amounts in thousands)

	Total
Year ending December 31,
2015	$	3,920
2016	3,843
2017	3,063
2018	2,138
2019	2,073
2020 and thereafter	8,573
Total	$	23,610