Goodwill and Other Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2015

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, 2015, 2014, and 2013.

Changes in the Carrying Amount of Goodwill

(Dollar amounts in thousands)

	Years Ended December 31,
	2015		2014		2013
Beginning balance	$	310,589	$	264,062	$	265,477
Acquisitions	8,418		46,527		—
Sale of equity method investment	—		—		(1,415		)
Ending balance	$	319,007	$	310,589	$	264,062

Schedule of Finite-Lived Intangible Assets

Other Intangible Assets

(Dollar amounts in thousands)

	Years Ended December 31,
	2015							2014							2013
	Gross		Accumulated Amortization		Net			Gross		Accumulated Amortization		Net			Gross		Accumulated Amortization		Net
Beginning balance	$	47,970	$	24,360	$	23,610		$	33,775	$	21,471	$	12,304		$	33,775	$	18,193	$	15,582
Additions	580		—		580			14,195		—		14,195			—		—		—
Amortization expense	—		3,920		(3,920		)	—		2,889		(2,889		)	—		3,278		(3,278		)
Ending balance	$	48,550	$	28,280	$	20,270		$	47,970	$	24,360	$	23,610		$	33,775	$	21,471	$	12,304
Weighted-average remaining life (in years)					7.4							8.0							5.9
Estimated remaining useful lives (in years)					0.8 to 10.0							0.3 to 10.3							0.2 to 11.3

Schedule of Finite-Lived Intangible Assets, Future Amortization Expense

Scheduled Amortization of Other Intangible Assets

(Dollar amounts in thousands)

	Total
Year ending December 31,
2016	$	3,901
2017	3,121
2018	2,196
2019	2,131
2020	2,080
2021 and thereafter	6,841
Total	$	20,270